Is 18x18 pillow inserts set of 4 profitable to sell on Amazon United States?

The niche generates $369K/yr across 22 tracked products. 7 of 7 products launched in the last 360 days are still selling. 90-day search growth is -2.5%. Flapen's verdict: Worth a look (57/100).

How competitive is the 18x18 pillow inserts set of 4 niche?

13 brands and 16 sellers compete. The top 5 products take 52% of clicks and top 5 brands hold 79% of demand.

What do buyers complain about in 18x18 pillow inserts set of 4?

Top complaints mined from reviews: Fluffiness, Thickness, Quality-Overall. The return rate is 1.3%.

When does demand for 18x18 pillow inserts set of 4 peak?

Demand peaks in Sep–Oct–Nov–Dec; the busiest month runs 3.5× the quietest.

What does it cost to enter the 18x18 pillow inserts set of 4 niche?

Listings span $14.25–$31.83; the average listing price is $20.44 (sweet spot $15–$100). The average incumbent carries 11,599 reviews — the moat a new listing must climb.

18x18 pillow inserts set of 4

Worth a look

Shows searches that convert (11.4% search→purchase), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Conversion

Great11.4%

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

Price range

Great$14.25–$31.83

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

Returns

Great1.3%

return rate — above 5% kills the launch gate

Avg price

Great$20.44

avg listing price — sweet spot $15–$100

Competition

Good52%

top-5 click share — leaders hold, buyers still browse

Market size

Good$369K

$369K/yr · 158K searches

Quality gap

Okay4.5★

avg incumbent rating — lower means beatable quality

Brand share

Okay79%

top-5 brand share — brands hold most of the demand

Growth

Bad-2.5%

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

Review moat

Bad11,598.95

avg incumbent reviews — the moat a new listing must climb

According to Flapen's Amazon United States niche tracking, 18x18 pillow inserts set of 4 is a $369K/yr Amazon United States market (158K searches/yr). The top 5 brands hold 79% of demand. Demand peaks in Sep–Oct–Nov–Dec. Verdict: Worth a look — 57/100.

Data updated Jul 29, 2026 · scored weekly · How we score niches

18x18 pillow inserts set of 4 market data

Units sold / yr: 15K–20K; avg 750–1,000/product
Revenue / yr: $307K–$409K; units × avg price
Conversion rate: 11.4%
Avg BSR: #61
Page quality: 0%
Prime: 100%
Sponsored: 95%
Out of stock: 0.0%
Avg brand age: 36 months
Avg seller age: 187 days

Competition & brand share

The top 5 products take 52% of clicks — established leaders, but buyers still shop beyond them.

Brands

13 rising

Sellers

Top-5 brand share

79%

Top 20: 100%

Top-5 click share

52%

Top 20: 98%

Open market

14%

MIULEE32%
EDOW15%
Utopia Bedding12%
QUBA LINEN11%
Phantoscope9%
Fabornus7%
Open — no brand owns it (7 brands, 14%)

Demand & seasonality

Weekly Amazon search volume, last 102 weeks — -2.5% search growth over the last 90 days.

Peak months: Sep, Oct, Nov, Dec · busiest ÷ quietest = 3.5×

Open Trend

Top 18x18 pillow inserts set of 4 search terms

18x18 pillow inserts 4 pack19K/yr +84.0%10.1% conv.
18x18 pillow inserts set of 443K/yr -43.0%9.9% conv.
18x18 pillows set of 420K/yr -11.5%11.3% conv.
pillows 18x18 set of 411K/yr -3.7%10.0% conv.
4 18x18 pillow inserts10K/yr -0.1%12.4% conv.
18 x 18 pillow inserts set of 49K/yr -2.2%13.4% conv.
18x18 pillows 4 pack5K/yr +33.8%9.0% conv.
18 x 18 pillows set of 45K/yr +16.4%15.2% conv.
4 18x18 pillows5K/yr +19.9%12.7% conv.
pillow inserts 18x18 set of 45K/yr +1.5%12.9% conv.

All search terms

Top 18x18 pillow inserts set of 4 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 22 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

MIULEE 18x18 Pillow Inserts 4 Pack 100% Virgin Fiber Filling Throw Pillows

MIULEE$19.734.7★1,616 rev

QUBA LINEN 18 x 18 Throw Pillow Insert - Pack of 4 White Down Alternative Pillow Inserts for Decorative Pillow Covers Throw Pillows for Bed Couch Pillows for Living Room (18 x 18 (Pack of 4))

QUBA LINEN$16.874.0★881 rev

Utopia Bedding Throw Pillows Decorative 18x18 Pillow Inserts Set of 4

Utopia Bedding$23.324.7★126,455 rev

EDOW Throw Pillow Inserts Set of 4 Lightweight Down Alternative Polyester Pillow Couch Cushion Sham Stuffer Machine Washable. (White 18x18)

EDOW$19.734.3★26,438 rev

MIULEE 18x18 Pillows Inserts Pack of 4 Down Alternative Virgin Filling

MIULEE$20.954.8★532 rev

Newest

by launch date

MIULEE 18x18 Inch Pillow Inserts Pack of 4 with 100% Cotton Cover

MIULEE$21.0951 rev

2mo ago

Fabornus 18 x 18 Inch Throw Pillow Inserts Set of 4 Square White Cushion Forms with Brown Piping 500g Filled for Decorative Pillow Covers

Fabornus$17.2345 rev

4mo ago

MIULEE 18x18 Pillow Inserts Premium Feather and Down Pillows Pack of 4

MIULEE$31.83183 rev

5mo ago

18x18 Throw Pillow Inserts Set of 4 500g Extra Filled Decorative Pillow Inserts with Grey Piped Edge Soft Fluffy Supportive Couch Sofa Bed Pillow Forms Hypoallergenic Polyester Fiber White

Generic$17.58127 rev

6mo ago

MIULEE 18x18 Pillows Inserts Pack of 4 Down Alternative Virgin Filling

MIULEE$20.95532 rev

6mo ago

What buyers say about 18x18 pillow inserts set of 4

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

What buyers love

Quality-Overall16%

“Good quality and the size is accurate”

Size-Overall12%

“they are easy to fit”

Soft Feel11%

“Comfy and soft”

Fluffiness11%

“Comfortable and fluffy”

Value For Money10%

“Cheap price”

Cushion10%

“Great cushion”

Comfort-Overall6%

“Nice, comfortable”

Advertised Vs Actual Product4%

“Exactly as advertised”

Foam3%

“Pillows are great”

Shape/Style1%

“Holds shape”

What buyers complain about

Fluffiness24%

“Pillows do not fluff”

Thickness15%

“just not as thick as I imagined”

Quality-Overall12%

“Awful quality”

Size-Overall7%

“the fit is pretty loose”

Cushion5%

“Not as padded as expected”

Advertised Vs Actual Product4%

“Not look like picture”

Value For Money4%

“Not worth the low cost”

Strength3%

“Not as sturdy as I thought they would be”

Stretchability/Expandability/Elasticity2%

“Horrrible, they do not expand anymore than how they come”

Shape/Style2%

“Does not take shape as advertised”

Top return reasons

Size-Overall49%

Cushion14%

Fluffiness6%

Advertised Vs Actual Product6%

Value For Money5%

Quality-Overall4%

Thin4%

Material Quality2%

Thickness2%

Defective Material/Parts1%

Common questions

Is 18x18 pillow inserts set of 4 profitable to sell on Amazon United States?: The niche generates $369K/yr across 22 tracked products. 7 of 7 products launched in the last 360 days are still selling. 90-day search growth is -2.5%. Flapen's verdict: Worth a look (57/100).
How competitive is the 18x18 pillow inserts set of 4 niche?: 13 brands and 16 sellers compete. The top 5 products take 52% of clicks and top 5 brands hold 79% of demand.
What do buyers complain about in 18x18 pillow inserts set of 4?: Top complaints mined from reviews: Fluffiness, Thickness, Quality-Overall. The return rate is 1.3%.
When does demand for 18x18 pillow inserts set of 4 peak?: Demand peaks in Sep–Oct–Nov–Dec; the busiest month runs 3.5× the quietest.
What does it cost to enter the 18x18 pillow inserts set of 4 niche?: Listings span $14.25–$31.83; the average listing price is $20.44 (sweet spot $15–$100). The average incumbent carries 11,599 reviews — the moat a new listing must climb.