4gb micro sd card
Skip itA small market ($46K/yr) — this niche doesn't clear our bar today.
Returns
Great1.2%return rate — above 5% kills the launch gate
Conversion
Great8.6%search→purchase rate — share of searches ending in a sale
Avg price
Great$17.52avg listing price — sweet spot $15–$100
Price range
Great$8.36–$35.64cheapest to priciest tracked listing — scored on the share inside $15–$100
Quality gap
Good4.4★avg incumbent rating — lower means beatable quality
Growth
Okay+14.9%90-day search growth — must beat 0% to launch
Brand share
Okay88%top-5 brand share — brands hold most of the demand
Review moat
Bad4,198.72avg incumbent reviews — the moat a new listing must climb
Competition
Bad71%top-5 click share — a locked-up shelf
Market size
Bad$46K$46K/yr · 31K searches
According to Flapen's Amazon United States niche tracking, 4gb micro sd card is a $46K/yr Amazon United States market (31K searches/yr). The top 5 brands hold 88% of demand. Verdict: Skip it — 47/100.
Data updated Jul 21, 2026 · scored weekly · How we score niches
4gb micro sd card market data
- Units sold / yr
- 3K–4K
- avg 100–250/product
- Revenue / yr
- $53K–$70K
- units × avg price
- Conversion rate
- 8.6%
- Avg BSR
- #145
- Page quality
- 0%
- Prime
- 94%
- Sponsored
- 72%
- Out of stock
- 5.9%
- Avg brand age
- 52 months
- Avg seller age
- 199 days
Competition & brand share
The top 5 products capture 71% of clicks — a locked-up shelf that new listings rarely crack.Brands
9 rising
Sellers
23
Top-5 brand share
88%
Top 20: 100%
Top-5 click share
71%
Top 20: 100%
Open market
7%
- Lerdisk29%
- Cloudisk29%
- Sandisk11%
- Motorola10%
- Bliksem9%
- KOOTION5%
- Open — no brand owns it (3 brands, 7%)
Demand
Weekly Amazon search volume, last 10 weeks — +14.9% search growth over the last 90 days.Top 4gb micro sd card search terms
- 4gb micro sd card17K/yr
- micro sd card 4gb10K/yr
- 4 gb micro sd card4K/yr
Top 4gb micro sd card 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 18 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Lerdisk Factory Wholesale Micro SD Card 4GB in Bulk Micro SDHC Class 6 Produced by Authorized Licencee (4GB Class 6)
Lerdisk$8.714.4★529 rev
Cloudisk Pack of 2 Micro SD Card 4GB Flash Memory Card C6 Micro SDHC with SD Adapter (4 GB)
Cloudisk$13.674.5★410 rev
SanDisk 4GB Micro SD Memory Card w/SD Adapter
Motorola$11.474.6★266 rev
2 Pack TF Card 8GB with Adapter High Speed Memory Card UHS-I C10 A1 Memory TF Card for Tablet/Mobile Phone/Camera/Car Audio/Game Console (TF162 Red Gold 8GB)
Bliksem$9.714.6★11,030 rev
Sandisk 4GB MicroSDHC Memory Card with SD Adapter
Sandisk$15.544.6★3,613 rev
Newest
by launch date
KOOTION 4 GB Micro SD Cards 5-Pack Class 4 MicroSD Flash Memory Card C4 TF Card with Adapter for MP3/MP4/Old Phones
KOOTION$22.3015 rev
4GB 5-Pack of Micro SD Cards EASTBULL 4GB SD Card Pack with 2 Adapters
EASTBULL$20.68701 rev
KEXIN 8GB Micro SD Card 5 Pack with SD Adapter microSDHC Memory Card UHS-I C10 Micro SD Card Full HD High Speed TF Card for Smartphone Tablet Action Camera Dash Cam Drone Game Console
KEXIN$22.438,757 rev
2 Pack TF Card 8GB with Adapter High Speed Memory Card UHS-I C10 A1 Memory TF Card for Tablet/Mobile Phone/Camera/Car Audio/Game Console (TF162 Red Gold 8GB)
Bliksem$9.7111,030 rev
2 Pack Memory Card 8GB with Adapter High Speed TF Card UHS-I C10 A1 Memory TF Card for Tablet/Mobile Phone/Camera/Car Audio/Game Console (TF183 White Gray 8GB)
Bliksem$8.362,864 rev
Trending
90-day click momentumKOOTION 4 GB Micro SD Cards 5-Pack Class 4 MicroSD Flash Memory Card C4 TF Card with Adapter for MP3/MP4/Old Phones
KOOTION$22.304.2★
Lerdisk Factory Wholesale Micro SD Card 4GB Pack of 3 in Bulk with SD Adapter MicroSDHC Produced by Authorized Licencee(4GB)
Lerdisk$17.284.1★
KEXIN 8GB Micro SD Card 5 Pack with SD Adapter microSDHC Memory Card UHS-I C10 Micro SD Card Full HD High Speed TF Card for Smartphone Tablet Action Camera Dash Cam Drone Game Console
KEXIN$22.434.5★
Kingston 4 GB microSDHC Class 4 Flash Memory Card SDC4/4GB
Kingston$12.934.6★
Cloudisk Micro SD Card 4GB Flash Memory Card Micro SDHC C6 (4 GB)
Cloudisk$9.364.2★
What buyers say about 4gb micro sd card
What buyers praise and complain about, mined from review topics.What buyers love
“Cheap price,”
“As shown”
“Good quality”
“works great for dash cam, sandisk quality”
“Purchased for my husband and he said nice storage capacity and reliability”
“Fits perfectly”
“Write speed is fast - These are great to practice data recovery”
“Easy to use”
“Purchased for my husband and he said nice storage capacity and reliability”
“The high speed claim isn't just marketing speak; I noticed a significant improvement in loading times for apps and media”
What buyers complain about
“non functional in the shipping package”
“Poor Quality”
“One card stopped working after a month”
“FAKE CAPACITY — Buyer Beware”
“didnt work with my Resmed machine”
“Misleading advertising”
“Far to expensive for a used item”
“Worse, I experienced data corruption errors on the very first day trying to transfer a batch of files”
“Unfortunately this would not work with a Garmin GPS unit that I had”
“2 of the 5 don't work”
Top return reasons
Common questions
- Is 4gb micro sd card profitable to sell on Amazon United States?
- The niche generates $46K/yr across 18 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +14.9%. Flapen's verdict: Skip it (47/100).
- How competitive is the 4gb micro sd card niche?
- 9 brands and 23 sellers compete. The top 5 products take 71% of clicks and top 5 brands hold 88% of demand.
- What do buyers complain about in 4gb micro sd card?
- Top complaints mined from reviews: Functionality-Overall, Quality-Overall, Durability. The return rate is 1.2%.
- What does it cost to enter the 4gb micro sd card niche?
- Listings span $8.36–$35.64; the average listing price is $17.52 (sweet spot $15–$100). The average incumbent carries 4,199 reviews — the moat a new listing must climb.