Is stem bins profitable to sell on Amazon United States?

The niche generates $302K/yr across 6 tracked products. 90-day search growth is +30.3%. Flapen's verdict: Skip it (43/100).

How competitive is the stem bins niche?

3 brands and 7 sellers compete. The top 5 products take 95% of clicks and top 5 brands hold 100% of demand.

What do buyers complain about in stem bins?

Top complaints mined from reviews: Magnetic Strength/Adsorption, Color, Fun/Entertainment Experience. The return rate is 1.3%.

When does demand for stem bins peak?

Demand peaks in Jul–Nov–Dec; the busiest month runs 2.5× the quietest.

What does it cost to enter the stem bins niche?

Listings span $9.70–$69.87; the average listing price is $25.81 (sweet spot $15–$100). The average incumbent carries 5,415 reviews — the moat a new listing must climb.

stem bins

Skip it

Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.

Avg price

Incredible$25.81

avg listing price — sweet spot $15–$100

Returns

Great1.3%

return rate — above 5% kills the launch gate

Price range

Great$9.70–$69.87

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

Conversion

Good5.1%

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

Growth

Good+30.3%

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

Market size

Good$302K

$302K/yr · 230K searches

Review moat

Bad5,414.5

avg incumbent reviews — the moat a new listing must climb

Quality gap

Bad4.8★

avg incumbent rating — lower means beatable quality

Competition

Bad95%

top-5 click share — a locked-up shelf

Brand share

Bad100%

top-5 brand share — brand-locked demand

According to Flapen's Amazon United States niche tracking, stem bins is a $302K/yr Amazon United States market (230K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Jul–Nov–Dec. Verdict: Skip it — 43/100.

Data updated Jul 30, 2026 · scored weekly · How we score niches

stem bins market data

Units sold / yr: 15K–20K; avg 2,000–2,500/product
Revenue / yr: $387K–$516K; units × avg price
Conversion rate: 5.1%
Avg BSR: #821
Page quality: 0%
Prime: 100%
Sponsored: 83%
Out of stock: 1.0%
Avg brand age: 46 months
Avg seller age: 162 days

Competition & brand share

The top 5 products capture 95% of clicks — a locked-up shelf that new listings rarely crack.

Brands

3 falling

Sellers

Top-5 brand share

100%

Top 20: 100%

Top-5 click share

95%

Top 20: 100%

Open market

Brain Flakes83%
Coodoo11%
PicassoTiles6%
Open — no brand owns it (0%)

Demand & seasonality

Weekly Amazon search volume, last 104 weeks — +30.3% search growth over the last 90 days.

Peak months: Jul, Nov, Dec · busiest ÷ quietest = 2.5×

Open Trend

Top stem bins search terms

brain flakes113K/yr +26.4%6.7% conv.
indoor recess23K/yr +153.7%0.1% conv.
coodoo magnetic tiles39K/yr -19.7%3.7% conv.
indoor recess toys for classroom14K/yr +67.3%0.1% conv.
indoor recess toys14K/yr +24.5%0.0% conv.
brain flakes 500 piece set11K/yr +13.6%11.3% conv.
brainflakes5K/yr +32.3%6.8% conv.
brain flakes for kids ages 4-84K/yr +29.7%5.5% conv.
coodoo7K/yr -19.4%1.0% conv.

All search terms

Top stem bins 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★)

All 6 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

Brain Flakes 500 Piece Set Ages 3+ Interlocking Plastic Disc Toy for Creative Building Educational STEM Learning Construction Block Play for Kids Teens Adults Boys and Girls

Brain Flakes$19.854.8★14,449 rev

Brain Flakes 2500 Piece Build n Build Kit - A Creative and Educational Alternative to Building Blocks - Wheel Pieces and Special Parts Included - A Great Stem Toy for Both Boys and Girls

Brain Flakes$69.874.8★369 rev

Coodoo Magnetic Tiles Kids Toys STEM Magnet Toy for Toddler Magnetic Blocks Building Preschool Learning Sensory Montessori Toys for 3+ Year Old Boys and Girls Safe Creativity Toddler Kids Toy 40PCS

Coodoo$19.734.9★12,465 rev

PicassoTiles 300 Piece Interlocking Disc Building Chips STEM Toy for Kids

PicassoTiles$14.514.7★280 rev

Brain Flakes Starter Set Multicolor (12 Colors) - 120 Pieces - Resealable Pouch

Brain Flakes$9.704.8★52 rev

Newest

by launch date

Brain Flakes Starter Set Multicolor (12 Colors) - 120 Pieces - Resealable Pouch

Brain Flakes$9.7052 rev

1y ago

PicassoTiles 300 Piece Interlocking Disc Building Chips STEM Toy for Kids

PicassoTiles$14.51280 rev

2y ago

Coodoo 60 PCS Magnetic Building Tiles Kids Toys STEM Magnetic Blocks Sensory Toys Kids Games Magnet Building Toy for Boys and Girls Aged 3+ Kid Brain Development Preschool Kindergarten Toddler Toy

Coodoo$21.194,872 rev

3y ago

Coodoo Magnetic Tiles Kids Toys STEM Magnet Toy for Toddler Magnetic Blocks Building Preschool Learning Sensory Montessori Toys for 3+ Year Old Boys and Girls Safe Creativity Toddler Kids Toy 40PCS

Coodoo$19.7312,465 rev

3y ago

Brain Flakes 2500 Piece Build n Build Kit - A Creative and Educational Alternative to Building Blocks - Wheel Pieces and Special Parts Included - A Great Stem Toy for Both Boys and Girls

Brain Flakes$69.87369 rev

6y ago

What buyers say about stem bins

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

What buyers love

Fun/Entertainment Experience31%

“Fun fun”

Creativity13%

“Be creative”

Quality-Overall11%

“Great blocks”

Magnetic Strength/Adsorption11%

“Magnetic tiles”

Value For Money6%

“Great price”

Educational-Overall5%

“Educational”

Gifting Purpose4%

“A favorite gift”

Color3%

“Colors are bright”

Durability3%

“Quality and durable”

Design-Overall2%

“Loved building differently each piece”

What buyers complain about

Magnetic Strength/Adsorption40%

“The magnets could be stronger”

Color17%

“The verity of colors was not a good mix either”

Fun/Entertainment Experience7%

“overall was just not a fun toy we enjoyed”

Choking5%

“But I do think that they're too big to actually choke on”

Size-Overall5%

“Small,”

Top return reasons

Size-Overall27%

Value For Money16%

Magnetic Strength/Adsorption11%

Advertised Vs Actual Product8%

Defective Material/Parts7%

Quality-Overall4%

Gifting Purpose3%

Connectivity-Overall3%

Assembly/Installation3%

Choking2%

Common questions

Is stem bins profitable to sell on Amazon United States?: The niche generates $302K/yr across 6 tracked products. 90-day search growth is +30.3%. Flapen's verdict: Skip it (43/100).
How competitive is the stem bins niche?: 3 brands and 7 sellers compete. The top 5 products take 95% of clicks and top 5 brands hold 100% of demand.
What do buyers complain about in stem bins?: Top complaints mined from reviews: Magnetic Strength/Adsorption, Color, Fun/Entertainment Experience. The return rate is 1.3%.
When does demand for stem bins peak?: Demand peaks in Jul–Nov–Dec; the busiest month runs 2.5× the quietest.
What does it cost to enter the stem bins niche?: Listings span $9.70–$69.87; the average listing price is $25.81 (sweet spot $15–$100). The average incumbent carries 5,415 reviews — the moat a new listing must climb.