ninja birthday party decorations
Worth a lookShows a thin review moat (101 avg reviews), but soft demand (-16.4% this quarter) keeps it on the watch list.
Review moat
Great101.17avg incumbent reviews — the moat a new listing must climb
Avg price
Great$18.04avg listing price — sweet spot $15–$100
Brand share
Great55%top-5 brand share — no brand owns this niche
Price range
Great$6.92–$40.19cheapest to priciest tracked listing — scored on the share inside $15–$100
Competition
Good41%top-5 click share — leaders hold, buyers still browse
Conversion
Good4.3%search→purchase rate — share of searches ending in a sale
Returns
Okay3.0%return rate — above 5% kills the launch gate
Market size
Bad$93K$93K/yr · 121K searches
Quality gap
Bad4.6★avg incumbent rating — lower means beatable quality
Growth
Bad-16.4%90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, ninja birthday party decorations is a $93K/yr Amazon United States market (121K searches/yr). The top 5 brands hold 55% of demand. Verdict: Worth a look — 50/100.
Data updated Jul 23, 2026 · scored weekly · How we score niches
ninja birthday party decorations market data
- Units sold / yr
- 6K–8K
- avg 100–250/product
- Revenue / yr
- $108K–$144K
- units × avg price
- Conversion rate
- 4.3%
- Avg BSR
- #2,188
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 91%
- Out of stock
- 5.3%
- Avg brand age
- 34 months
- Avg seller age
- 173 days
Competition & brand share
The top 5 products take 41% of clicks — established leaders, but buyers still shop beyond them.Brands
26 falling
Sellers
27
Top-5 brand share
55%
Top 20: 95%
Top-5 click share
41%
Top 20: 84%
Open market
41%
- Bezkega22%
- Tevxj15%
- ZOIIWA7%
- ZHUOWEISM6%
- Eerrhhaq5%
- BOIKOKY5%
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -16.4% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.9×
Top ninja birthday party decorations search terms
- ninja birthday party decorations39K/yr
- ninja party decorations24K/yr
- ninja party12K/yr
- ninja birthday9K/yr
- ninja birthday decorations7K/yr
- ninja decorations5K/yr
- ninja kids birthday party decorations6K/yr
- ninja birthday party6K/yr
- ninja party supplies5K/yr
- ninja kidz party decorations8K/yr
Top ninja birthday party decorations 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.
All 24 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Ninja Birthday Party Decorations Tableware 193pcs Ninja Warrior Party Decorations Plates and Napkins Cups Tablecloths Cake Topper Balloon for Ninja Party Supplies Serves 24
Bezkega$25.694.6★16 rev
162 Pcs Ninja Birthday Party Decoration Set Ninja Warrior Party Supplies Kit Includes Karate Master Tableware Tablecloth Hanging Banners Foil Swirls Cutouts Balloons for Kids Boys Karate Party Favors
Tevxj$25.864.7★157 rev
98 Pieces Ninja Birthday Party Decorations Ninja Warrior Tableware Set Karate Plates Napkins Tablecloth Ninja Master Birthday Party Supplies Kit Table Cover Dinnerware Party Favors
Tevxj$20.804.7★775 rev
Eerrhhaq 12 Pcs Inflatable Ninja Samurai Sword Inflated Katana Sword Toy Blow Up Ninja Swords for Party Favors Cosplay Samurai Theme Party
Eerrhhaq$13.474.2★129 rev
Ninja Birthday Party Decoration Tableware Set 142pcs Plates and Napkins Supplies Include Warrior Plates Napkin Cups Tablecloth Banner for Ninja Master Birthday Decor
Bezkega$23.244.8★66 rev
Newest
by launch date
NeoRov 301 Pcs Ninja Birthday Party Decorations Tableware Balloon Arch Set
NeoRov$29.008 rev
Ninja Birthday Party Decorations Tableware 193pcs Ninja Warrior Party Decorations Plates and Napkins Cups Tablecloths Cake Topper Balloon for Ninja Party Supplies Serves 24
Bezkega$25.6916 rev
Bafeil 3 Pcs Ninja Birthday Party Porch Banner with Fringe Backdrop Curtains Warrior Theme Party Decorations Ninja Door Hanging Banner Party Supplies for Karate Master Birthday Photo Booth Props
Bafeil$15.4014 rev
Holkcog Ninja Birthday Party Decorations Martial Arts Karate Kung Fu Themed Party Banner Hanging Decor Spirals Swirls Bollons Red and Black for Party Decor Cosplay Samurai Theme Baby Shower Party
Holkcog$18.7412 rev
12 Pack Ninja Party Favors for Kids - Individually Wrapped Paint Your Own Wooden Craft Kits Boy Birthday Decorations & Kidz Party Supplies 4-8 8-12 Goodie Bag Stuffers
BOIKOKY$19.8248 rev
Trending
90-day click momentumNeoRov 301 Pcs Ninja Birthday Party Decorations Tableware Balloon Arch Set
NeoRov$29.005.0★
Bafeil 3 Pcs Ninja Birthday Party Porch Banner with Fringe Backdrop Curtains Warrior Theme Party Decorations Ninja Door Hanging Banner Party Supplies for Karate Master Birthday Photo Booth Props
Bafeil$15.404.8★
Holkcog Ninja Birthday Party Decorations Martial Arts Karate Kung Fu Themed Party Banner Hanging Decor Spirals Swirls Bollons Red and Black for Party Decor Cosplay Samurai Theme Baby Shower Party
Holkcog$18.745.0★
Ninja Birthday Party Decorations Tableware 193pcs Ninja Warrior Party Decorations Plates and Napkins Cups Tablecloths Cake Topper Balloon for Ninja Party Supplies Serves 24
Bezkega$25.694.6★
ZOIIWA 48Pcs Karate Headbands Birthday Party Favors Red Karate Themed Headbands Party Decorations for Kids Boys Girls Adults Birthday Party Supplies Costumes Decorations and Gifts Adjustable Size
ZOIIWA$12.044.4★
What buyers say about ninja birthday party decorations
What buyers praise and complain about, mined from review topics.What buyers love
“Its a great kit”
“colorful”
“Very fun for birthday party”
“so the theme was perfect”
“Arrived as pictured”
“Good for the money”
“looked great once everything was put together”
“The plates were durable for pizza”
“Great size and quality”
“It's convenient”
What buyers complain about
“most of them deflated with play”
“The plates are a little flimsy”
“The balloons were the only issue—some came a little thin”
“Needs quality control”
“A couple of the paints were a bit dried out”
“They were just a lot smaller than expected from the pictures”
“The headbands were a cheap almost plastic type cloth that was stiff and rough”
“Yes, when you first open this you might smell that funny smell,”
“needs to be clearer that its not assembled”
“Material is itchy plastic”
Top return reasons
Common questions
- Is ninja birthday party decorations profitable to sell on Amazon United States?
- The niche generates $93K/yr across 35 tracked products. 2 of 8 products launched in the last 360 days are still selling. 90-day search growth is -16.4%. Flapen's verdict: Worth a look (50/100).
- How competitive is the ninja birthday party decorations niche?
- 26 brands and 27 sellers compete. The top 5 products take 41% of clicks and top 5 brands hold 55% of demand.
- What do buyers complain about in ninja birthday party decorations?
- Top complaints mined from reviews: Inflation/Deflation, Strength, Thickness. The return rate is 3.0%.
- When does demand for ninja birthday party decorations peak?
- Demand is steady year-round — the busiest month runs 1.9× the quietest.
- What does it cost to enter the ninja birthday party decorations niche?
- Listings span $6.92–$40.19; the average listing price is $18.04 (sweet spot $15–$100). The average incumbent carries 101 reviews — the moat a new listing must climb.