Is slime birthday party decorations profitable to sell on Amazon United States?

The niche generates $28K/yr across 40 tracked products. 0 of 6 products launched in the last 360 days are still selling. 90-day search growth is +3.6%. Flapen's verdict: Worth a look (50/100).

How competitive is the slime birthday party decorations niche?

27 brands and 39 sellers compete. The top 5 products take 36% of clicks and top 5 brands hold 53% of demand.

What do buyers complain about in slime birthday party decorations?

Top complaints mined from reviews: Size-Overall, Hard Feel, Advertised Vs Actual Product. The return rate is 1.3%.

When does demand for slime birthday party decorations peak?

Demand peaks in Jan; the busiest month runs 2.0× the quietest.

What does it cost to enter the slime birthday party decorations niche?

Listings span $5.91–$31.87; the average listing price is $16.48 (sweet spot $15–$100). The average incumbent carries 642 reviews — the moat a new listing must climb.

slime birthday party decorations

Worth a look

Shows low returns (1.3%), but a small market ($28K/yr) keeps it on the watch list.

Returns

Great1.3%

return rate — above 5% kills the launch gate

Brand share

Great53%

top-5 brand share — no brand owns this niche

Competition

Great36%

top-5 click share — an open shelf

Avg price

Great$16.48

avg listing price — sweet spot $15–$100

Review moat

Good642.35

avg incumbent reviews — the moat a new listing must climb

Price range

Good$5.91–$31.87

cheapest to priciest tracked listing — scored on the share inside $15–$100

Growth

Okay+3.6%

90-day search growth — must beat 0% to launch

Conversion

Okay2.1%

search→purchase rate — share of searches ending in a sale

Quality gap

Bad4.7★

avg incumbent rating — lower means beatable quality

Market size

Bad$28K

$28K/yr · 78K searches

Signals No Dominant Brand Low Review Barrier

According to Flapen's Amazon United States niche tracking, slime birthday party decorations is a $28K/yr Amazon United States market (78K searches/yr). The top 5 brands hold 53% of demand. Demand peaks in Jan. Verdict: Worth a look — 50/100.

Data updated Jul 23, 2026 · scored weekly · How we score niches

slime birthday party decorations market data

Units sold / yr: 3K–3K; avg 0–100/product
Revenue / yr: $41K–$49K; units × avg price
Conversion rate: 2.1%
Avg BSR: #3,960
Page quality: 0%
Prime: 100%
Sponsored: 98%
Out of stock: 9.0%
Avg brand age: 33 months
Avg seller age: 139 days

Competition & brand share

Clicks spread well past the top 5 (36% combined) — an open shelf where new products get seen.

Brands

27 falling

Sellers

Top-5 brand share

53%

Top 20: 95%

Top-5 click share

36%

Top 20: 81%

Open market

42%

Lezty15%
Xigejob13%
MOAXMOA10%
Suhelkit9%
Tingjoo6%
FUN KIDZ5%

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +3.6% search growth over the last 90 days.

Peak months: Jan · busiest ÷ quietest = 2.0×

Open Trend

Top slime birthday party decorations search terms

slime party decorations27K/yr +1.3%2.1% conv.
slime party21K/yr +8.0%1.2% conv.
slime birthday party decorations21K/yr +1.3%1.9% conv.
slime birthday party5K/yr +21.3%1.1% conv.
slime birthday3K/yr -13.5%0.9% conv.

All search terms

Top slime 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.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)1 product missing review or click data not plotted

All 24 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Xigejob Slime Birthday Party Decorations Tableware - Splatter Splash Colorful Theme Pink Slime Party Supplies Dinnerware Paper Plate Cup Napkin Tablecloth Cutlery | Serves 24

Xigejob$22.774.6★47 rev

Suhelkit Slime Birthday Party Decorations Tableware Purple Glitter Splatter Splash Colorful Theme Slime Party Supplies Plate Cup Napkin Tablecloth Cutlery Serves 24

Suhelkit$23.134.9★35 rev

199 Pcs Slime Birthday Party Supplies Decorations - Colorful Its Slime Time Plates Napkins Cups Tableware Kit Tablecloth Backdrop Banner Cake Cupcake Toppers for Splatter Theme Girls Birthday Decor

Lezty$28.825.0★6 rev

Slime Birthday Party Decorations Kit - Slime Queen Cake Topper Birthday Banner Cupcake Toppers Colorful Balloons for Kids Slime Party Baby Shower Party Supplies

MOAXMOA$14.454.6★75 rev

Its Slime Time Theme Photography Backdrop 5x3ft Colorful Fiesta Happy Birthday Party Decoration Photo Background for Kids Baby Shower Newborn Cake Table Studio Props Banner

XLL$6.724.7★217 rev

Newest

by launch date

Owelleny Slime Birthday Party Decorations Pastel Pink Purple Glitter Splatter Splash Colorful Slime Party Supplies Plate Napkin Cup Banner Tablecloth Balloon Swirls Topper Cutlery Serves 24

Owelleny$22.254 rev

3mo ago

3PCS Its Slime Time Door Decorations Porch Banner Colorful Graffiti Splash Paint Photo Background Fiesta Slime Children Happy Birthday Party Hanging Backdrop Props Supplies Photography

ZANMENCNER$13.222 rev

6mo ago

196 Pcs Slime 9th Birthday Party Supplies Decorations - Colorful Slime Queen Plates Napkins Cups Tableware Table Cloth Backdrop Banner Cupcake Toppers for Splatter Splash Theme Birthday Decor

Lezty$26.560 rev

10mo ago

Roselush 16 Pcs Slime Party Favor Bags - Slime Lickers Candy & Art Decorations

Roselush$17.547 rev

1y ago

Tingjoo 213 Pcs Slime Party Decorations Include Balloons Banner Tablecloth Plates Napkins Cups and Cutlery Set for Birthday Art Painting Slime Time Splatter Splash Supplies Party Decors Serves 25

Tingjoo$31.878 rev

1y ago

What buyers say about slime birthday party decorations

What buyers praise and complain about, mined from review topics.

What buyers love

Fun/Entertainment Experience19%

“Great fun”

Quality-Overall13%

“also good with a little bit of lotion the clear slimes however were perfect no complaints about those”

Color10%

“vibrant colors”

Value For Money9%

“Good for the price”

Gifting Purpose8%

“Great gift”

Smell5%

“best part is that smell amazing super fruity”

Stretchability/Expandability/Elasticity3%

“it stretches good it was soooo fun”

Adhesion/Stickiness2%

“So no problems with getting the stickiness”

Ease Of Cleaning2%

“Kept her clean”

Advertised Vs Actual Product2%

“Exactly as advertised”

What buyers complain about

Size-Overall30%

“The kit is very small”

Hard Feel6%

“The crystal slime was hard”

Advertised Vs Actual Product4%

“does NOT look like the photo”

Value For Money3%

“Little expensive”

Mess Free3%

“the One of the three slimes cloud slime it's very messy”

Texture/Consistency-Overall3%

“the texture is a bit weird”

Adhesion/Stickiness3%

“arrived off stick”

Quality-Overall2%

“Not the best item do not buy”

Color2%

“all are different colors”

Ease Of Use2%

“Slime was hard to open”

Top return reasons

Size-Overall31%

Advertised Vs Actual Product12%

Value For Money9%

Texture/Consistency-Overall6%

Moist/Dry4%

Material Quality4%

Quality-Overall3%