8/3 romex
Skip itStrong incumbent ratings (4.7★) — this niche doesn't clear our bar today.
Review moat
Great128.65avg incumbent reviews — the moat a new listing must climb
Avg price
Good$139.67avg listing price — sweet spot $15–$100
Market size
Good$470K$470K/yr · 103K searches
Competition
Okay57%top-5 click share — leaders hold, buyers still browse
Returns
Okay3.7%return rate — above 5% kills the launch gate
Conversion
Okay3.3%search→purchase rate — share of searches ending in a sale
Brand share
Okay85%top-5 brand share — brands hold most of the demand
Price range
Okay$25.50–$293.18cheapest to priciest tracked listing — scored on the share inside $15–$100
Growth
Bad-5.5%90-day search growth — must beat 0% to launch
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
According to Flapen's Amazon United States niche tracking, 8/3 romex is a $470K/yr Amazon United States market (103K searches/yr). The top 5 brands hold 85% of demand. Verdict: Skip it — 41/100.
Data updated Jul 27, 2026 · scored weekly · How we score niches
8/3 romex market data
- Units sold / yr
- 3K–4K
- avg 100–250/product
- Revenue / yr
- $419K–$559K
- units × avg price
- Conversion rate
- 3.3%
- Avg BSR
- #386
- Page quality
- 0%
- Prime
- 88%
- Sponsored
- 81%
- Out of stock
- 6.5%
- Avg brand age
- 51 months
- Avg seller age
- 147 days
Competition & brand share
The top 5 products take 57% of clicks — established leaders, but buyers still shop beyond them.Brands
10 falling
Sellers
32
Top-5 brand share
85%
Top 20: 100%
Top-5 click share
57%
Top 20: 94%
Open market
8%
- Southwire26%
- XMK24%
- energeaster22%
- VN Infinite quality7%
- Woods6%
- wirenco6%
- Open — no brand owns it (4 brands, 8%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -5.5% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.3×
Top 8/3 romex search terms
- 8/3 romex36K/yr
- 8/3 wire21K/yr
- 8/3 wire with ground16K/yr
- 8-3 wire4K/yr
- 8/3 romex 50 ft4K/yr
- 8-3 wire with ground7K/yr
- 8-3 romex3K/yr
- 8/3 romex 75 ft4K/yr
- 8 3 wire3K/yr
- 8/3 romex 100 ft3K/yr
Top 8/3 romex 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
50ft NM-B 8/3 Wire with Ground 8/3 8 Gauge 3 Conductor Wire 8-3 Copper 8 AWG Non-Metallic Sheathed 8/3 NM-B W/G Cable Stranded Indoor Residential Electrical Wiring for Branch Circuit Switches&Outlets
XMK$141.014.8★88 rev
SOUTHWIRE COMPANY LL 63949202 Romex Type Nm-B Wg Non-Metallic Wire 125 ft. 8/3 Black
Southwire$283.944.5★65 rev
Southwire 75 ft. 8/3 NM-B Stranded Indoor Residential Electrical Wire - Black
Southwire$191.064.8★286 rev
Solid Indoor 8/3 Type NM-B Pure Copper Cable 25FT Black 8 AWG 3 Conductors with Ground Wire
energeaster$66.074.9★18 rev
Solid Indoor 8/3 Type NM-B Pure Copper Cable 50FT Black 8 AWG 3 Conductors with Ground Wire
energeaster$138.954.9★18 rev
Newest
by launch date
15ft NM-B 8/3 Wire with Ground 8/3 8 Gauge 3 Conductor Wire 8-3 Copper 8 AWG Non-Metallic Sheathed 8/3 NM-B W/G Cable Stranded Indoor Residential Electrical Wiring for Branch Circuit Switches&Outlets
XMK$52.1488 rev
35ft NM-B 8/3 Wire with Ground 8/3 8 AWG Copper Wire 8 Gauge 3 Conductor Non-Metallic Sheathed 8/3 NM-B Cable with Ground Stranded Indoor Residential Electrical Wiring for Branch Circuit Switch&Outlet
XMK$117.0888 rev
Solid Indoor 8/3 Type NM-B Pure Copper Cable 125FT White 8 AWG 3 Conductors with Ground Wire
energeaster$293.1818 rev
Solid Indoor 8/3 Type NM-B Pure Copper Cable 25FT Black 8 AWG 3 Conductors with Ground Wire
energeaster$66.0718 rev
Solid Indoor 8/3 Type NM-B Pure Copper Cable 50FT Black 8 AWG 3 Conductors with Ground Wire
energeaster$138.9518 rev
Trending
90-day click momentumSolid Indoor 8/3 Type NM-B Pure Copper Cable 125FT White 8 AWG 3 Conductors with Ground Wire
energeaster$293.184.9★
Solid Indoor 8/3 Type NM-B Pure Copper Cable 50FT Black 8 AWG 3 Conductors with Ground Wire
energeaster$138.954.9★
Solid Indoor 8/3 Type NM-B Pure Copper Cable 25FT Black 8 AWG 3 Conductors with Ground Wire
energeaster$66.074.9★
Solid Indoor 8/3 Type NM-B Pure Copper Cable 75FT Black 8 AWG 3 Conductors with Ground Wire
energeaster$205.444.9★
VN Infinite quality 8/3 NM-B Non-Metallic Sheathed Cable Stranded Residential Indoor Wire (50 Ft)
VN Infinite quality$140.924.5★
What buyers say about 8/3 romex
What buyers praise and complain about, mined from review topics.What buyers love
“As advertised”
“Good quality wires”
“Save money where you can”
“I was sure I could make it fit”
“Cable works great”
“The conductors strip cleanly”
“the sheathing held up nicely”
What buyers complain about
“Deceptive advertising”
“Ended up being a pain to run as I heat bent the 1/2 PVC during the initial installation”
“Not the easiest to manipulate”
“It's pretty pricey”
“would not fit past the heat bend”
Top return reasons
Common questions
- Is 8/3 romex profitable to sell on Amazon United States?
- The niche generates $470K/yr across 26 tracked products. 4 of 6 products launched in the last 360 days are still selling. 90-day search growth is -5.5%. Flapen's verdict: Skip it (41/100).
- How competitive is the 8/3 romex niche?
- 10 brands and 32 sellers compete. The top 5 products take 57% of clicks and top 5 brands hold 85% of demand.
- What do buyers complain about in 8/3 romex?
- Top complaints mined from reviews: Advertised Vs Actual Product, Heating, Ease Of Use. The return rate is 3.7%.
- When does demand for 8/3 romex peak?
- Demand is steady year-round — the busiest month runs 1.3× the quietest.
- What does it cost to enter the 8/3 romex niche?
- Listings span $25.50–$293.18; the average listing price is $139.67 (sweet spot $15–$100). The average incumbent carries 129 reviews — the moat a new listing must climb.