---
title: "Lego Birthday Party Supplies — $862K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/home-kitchen/lego-birthday-party-supplies"
last_updated: "2026-08-06T07:02:10.599Z"
locale: en
meta:
description: "Niche score 65/100 · $862K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 65/100 · $862K/yr market. A failed launch gate (market size, growth, or returns) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Lego Birthday Party Supplies — $862K/yr Amazon US Niche (2026) - Flapen"
---
# **lego birthday party supplies**
**Worth a look**
Shows no brand lock-in (top 5 brands take 35% of clicks), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Market size 75Growth 23Conversion 52Competition 88Returns 75Price range 78Avg price 81Brand share 96Review moat 81Quality gap 24
**Brand share**
**Incredible****35%**
top-5 brand share — no brand owns this niche
**Competition**
**Great****27%**
top-5 click share — an open shelf
**Review moat**
**Great****375.28**
avg incumbent reviews — the moat a new listing must climb
**Avg price**
**Great****$17.38**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$4.37–$53.36**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Market size**
**Great****$862K**
$862K/yr · 1.2M searches
**Returns**
**Great****2.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Good****4.3%**
search→purchase rate — share of searches ending in a sale
**Quality gap**
**Bad****4.6★**
avg incumbent rating — lower means beatable quality
**Growth**
**Bad****-4.7%**
90-day search growth — must beat 0% to launch
**Signals**[** No Dominant Brand**](https://flapen.com/research/niches?market=us&signal=no_dominant_brand "Top brand's click share < 20%")
According to Flapen's Amazon United States niche tracking, lego birthday party supplies is a $862K/yr Amazon United States market (1.2M searches/yr). The top 5 brands hold 35% of demand. Demand peaks in Jan. Verdict: Worth a look — 65/100.
Data updated Jul 23, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **lego birthday party supplies market data**
- **Units sold / yr**
- **40K–50K**
- avg 500–750/product
- **Revenue / yr**
- **$695K–$869K**
- units × avg price
- **Conversion rate**
- **4.3%**
- **Avg BSR**
- **#1,234**
- **Page quality**
- **0%**
- **Prime**
- **98%**
- **Sponsored**
- **89%**
- **Out of stock**
- **1.2%**
- **Avg brand age**
- **31 months**
- **Avg seller age**
- **151 days**
## **Competition & brand share**
Clicks spread well past the top 5 (27% combined) — an open shelf where new products get seen.
**Brands**
**44 **▼falling
**Sellers**
**130**
**Top-5 brand share**
**35%**
Top 20: 75%
**Top-5 click share**
**27%**
Top 20: 63%
**Open market**
**61%**
- LEGO11% - QIYANPAX10% - PHD CAKE6% - LINHAXM5% - Kinovo4% - Rossesay4%
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -4.7% search growth over the last 90 days.
30K20KSpike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Jan · busiest ÷ quietest = 1.9×
[**Open Trend **](https://flapen.com/research/us/home-kitchen/lego-birthday-party-supplies/trend)
## **Top lego birthday party supplies search terms**
- **lego birthday decorations**303K/yr+2.5%3.1% conv. - **lego party decorations**164K/yr-4.0%3.0% conv. - **lego birthday**121K/yr-2.4%2.3% conv. - **lego party**118K/yr-8.5%1.6% conv. - **lego decorations**69K/yr+12.7%1.1% conv. - **lego themed birthday party**41K/yr+4.5%1.9% conv. - **lego party supplies**48K/yr-7.3%2.7% conv. - **lego birthday party**30K/yr+6.7%1.9% conv. - **lego decorations for birthday party**29K/yr+4.6%2.7% conv. - **birthday lego**30K/yr-10.5%2.1% conv. [**All search terms **](https://flapen.com/research/us/home-kitchen/lego-birthday-party-supplies/search-terms)
## **Top lego birthday party supplies products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%3%$26K6%$52K9%$78K12%$103K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 24 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**173 PCS Building Block Birthday Party Decorations - Plates Napkins Cups Cutlery Cake & Cupcake Toppers Banner Hanging Swirls Tablecloth Balloons for Birthday Party Serves 20**QIYANPAX**$23.56**4.7★422 rev](https://www.amazon.com/dp/B0DRBNG72P) [2**PHD CAKE Number 7 Building Block Birthday Cake Candle Numeral Birthday Candles**PHD CAKE**$5.95**4.8★320 rev](https://www.amazon.com/dp/B0D12BZMLM) [3**LEGO Birthday Party Cake - Building Toy for Boys & Girls Ages 7+ - Birthday Decoration with 10 Candle Accessories - Craft for Kids - 40815**LEGO**$14.86**5.0★35 rev](https://www.amazon.com/dp/B0FJ49G284) [4**197 Pcs Building Blocks Birthday Paper Plates Tableware Set (Serves 24) Colorful Blocks Supplies Include Banner Pendant Plates Napkins Cups Forks Knives Tablecloth Topper Balloons For Kids Party**Kinovo**$27.40**4.6★48 rev](https://www.amazon.com/dp/B0FNJTLBQK) [5**Rossesay Building Block Number 0-9 Birthday Cake Candle Numeral Birthday Sparkler Candles for Building Block Cake Topper for Party Decorations Supplies(Number 5)**Rossesay**$6.88**4.5★845 rev](https://www.amazon.com/dp/B0CQYJX98Y)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**LEGO Birthday Party Cake - Building Toy for Boys & Girls Ages 7+ - Birthday Decoration with 10 Candle Accessories - Craft for Kids - 40815**LEGO**$14.86**35 rev1mo ago](https://www.amazon.com/dp/B0FJ49G284) [**NKPDAXM Building Block Birthday Decorations Colorful Building Block Plates Napkins Cups Tablecloth Banner Hanging Swirls Balloons Honeycomb Centerpieces for Block Birthday Party Serves 24**NKPDAXM**$20.86**59 rev4mo ago](https://www.amazon.com/dp/B0GS8YKV94) [**224Pcs Building Block Birthday Decorations ALL-IN-1 Serves 26**Haiyumaoyi**$25.12**12 rev4mo ago](https://www.amazon.com/dp/B0GQXR5ZNY) [**198Pcs Building Block Birthday Party Decorations with Plates Napkins Cups Banner Backdrop Tablecloth Balloons Cake Toppers Honeycombs for Boys Kids Birthday Party Supplies Serve 24 Guests**Gupesxu**$26.33**10 rev5mo ago](https://www.amazon.com/dp/B0C7MCVJ2M) [**Building Block Birthday Party Supplies Colorful Building Block Plates Napkins Cups Tablecloth Banner Hanging Swirls Balloons Honeycomb Centerpieces for Birthday Party Serves 24**LINHAXM**$19.85**9 rev6mo ago](https://www.amazon.com/dp/B0GHLTSTM7)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**NKPDAXM Building Block Birthday Decorations Colorful Building Block Plates Napkins Cups Tablecloth Banner Hanging Swirls Balloons Honeycomb Centerpieces for Block Birthday Party Serves 24**NKPDAXM**$20.86**4.6★**▲ 269%**](https://www.amazon.com/dp/B0GS8YKV94) [**224Pcs Building Block Birthday Decorations ALL-IN-1 Serves 26**Haiyumaoyi**$25.12**4.9★**▲ 268%**](https://www.amazon.com/dp/B0GQXR5ZNY) [**Building Block Birthday Party Decorations Includes Cake Toppers Banner Hanging Swirls Tablecloths Balloons for Building Block Party Decorations**HWYTRAP**$16.93**4.5★**▲ 264%**](https://www.amazon.com/dp/B0G631R734) [**Building Block Birthday Party Supplies Colorful Building Block Plates Napkins Cups Tablecloth Banner Hanging Swirls Balloons Honeycomb Centerpieces for Birthday Party Serves 24**LINHAXM**$19.85**4.8★**▲ 228%**](https://www.amazon.com/dp/B0GHLTSTM7) [**LEGO Birthday Party Cake - Building Toy for Boys & Girls Ages 7+ - Birthday Decoration with 10 Candle Accessories - Craft for Kids - 40815**LEGO**$14.86**5.0★**▲ 218%**](https://www.amazon.com/dp/B0FJ49G284)
**~~View all trending →~~**
## **What buyers say about lego birthday party supplies**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**13%
*“The variety is really good”*
**Color**12%
*“The colors are vibrant”*
**Value For Money**11%
*“Good for price”*
**Fun/Entertainment Experience**10%
*“Hours of Fun”*
**Size-Overall**5%
*“it fit our needs”*
**Advertised Vs Actual Product**5%
*“As advertised”*
**Gifting Purpose**5%
*“Its a gift”*
**Design-Overall**5%
*“the animal designs are cute”*
**Assembly/Installation**4%
*“Very easy to put together”*
**Ease Of Use**4%
*“Easy to use”*
### **What buyers complain about **
**Size-Overall**14%
*“Very small”*
**Quality-Overall**7%
*“Bad quality”*
**Value For Money**6%
*“What a huge waste of money”*
**Assembly/Installation**5%
*“Instructions are hard”*
**Inflation/Deflation**4%
*“The balloon would not stay inflated”*
**Instructions/User Manual/Troubleshooting**4%
*“Instructions are not the greatest”*
**Strength**3%
*“That said, they dont fit together quite as smoothly as name-brand blocks, and a few of the animal designs arent perfectly balanced, so they may not always stand on their own”*
**Functionality-Overall**2%
*“of course that didnt work”*
**Advertised Vs Actual Product**2%
*“Some Decorations are Different”*
**Thickness**2%
*“They were really thick”*
### **Top return reasons **
**Size-Overall**34%
**Value For Money**15%
**Advertised Vs Actual Product**11%
**Quality-Overall**9%
**Defective Material/Parts**5%
**Material Quality**4%
**Color**4%
**Thin**3%
**Inflation/Deflation**2%
**Design-Overall**1%
## **Common questions**
- **Is lego birthday party supplies profitable to sell on Amazon United States?**
- The niche generates $862K/yr across 57 tracked products. 7 of 19 products launched in the last 360 days are still selling. 90-day search growth is -4.7%. Flapen's verdict: Worth a look (65/100).
- **How competitive is the lego birthday party supplies niche?**
- 44 brands and 130 sellers compete. The top 5 products take 27% of clicks and top 5 brands hold 35% of demand.
- **What do buyers complain about in lego birthday party supplies?**
- Top complaints mined from reviews: Size-Overall, Quality-Overall, Value For Money. The return rate is 2.0%.
- **When does demand for lego birthday party supplies peak?**
- Demand peaks in Jan; the busiest month runs 1.9× the quietest.
- **What does it cost to enter the lego birthday party supplies niche?**
- Listings span $4.37–$53.36; the average listing price is $17.38 (sweet spot $15–$100). The average incumbent carries 375 reviews — the moat a new listing must climb.
## **Related niches in Home & Kitchen**
- 74 [**graduation centerpieces for tables 2023**](https://flapen.com/research/us/home-kitchen/graduation-centerpieces-for-tables-2023)$368K/yr+228.8%**Worth a look**- 74 [**artificial hanging flowers for outdoors**](https://flapen.com/research/us/home-kitchen/artificial-hanging-flowers-for-outdoors)$1.2M/yr+77.3%**Launch it**- 74 [**5th grade graduation decorations**](https://flapen.com/research/us/home-kitchen/5th-grade-graduation-decorations)$149K/yr+666.7%**Worth a look**- 74 [**green graduation decorations class of 2023**](https://flapen.com/research/us/home-kitchen/green-graduation-decorations-class-of-2023)$190K/yr+184.6%**Worth a look**- 74 [**flowers**](https://flapen.com/research/us/home-kitchen/flowers)$23.3M/yr+5.2%**Launch it**- 74 [**pool towel rack outdoor**](https://flapen.com/research/us/home-kitchen/pool-towel-rack-outdoor)$1.1M/yr+362.1%**Launch it**[**All Home & Kitchen niches **](https://flapen.com/research/us/home-kitchen)