Auto Parts Repricing
An eBay auto parts catalog isn't 50 listings — it's 3,000 brake rotors, 8,000 filters, and 15,000 gaskets, each tied to specific year/make/model fitments. A competitor drops a price at 2 a.m. and your identical part sits overpriced until you wake up. Undercut monitors every listing around the clock, beats the lowest comparable price automatically, and never crosses the cost floor you set per SKU. The Scale plan handles 10,000 active listings — built for exactly this volume.
A typical eBay Motors parts seller carries thousands of SKUs across dozens of categories — exhaust, suspension, brakes, filters, lighting. Checking prices manually even once a day on 5,000 listings would take a full-time employee doing nothing else. In practice it doesn't happen, which means listings drift overpriced for weeks while competitors undercut you, or get priced too low when supplier costs tick up. Undercut runs repricing checks as frequently as every 15 minutes on the Pro and Scale plans, reacting to competitor price changes faster than any spreadsheet workflow can. At $199/month for 10,000 listings, the Scale plan costs less than four hours of warehouse labor per month.
A 2018 F-150 brake rotor is not the same listing as a 2014 F-150 brake rotor, even if the part numbers look similar. Interchange numbers (OEM cross-references like Dorman 128.65071 mapping to multiple vehicle applications) mean one physical part can appear under dozens of titles with different fitment data. Undercut compares against active eBay listings for the same item, so fitment mismatches in competitor listings naturally filter out — you're competing against what the buyer actually sees as an alternative, not a different fitment that only superficially looks the same. Set your floor conservatively on high-fitment-variance parts where true comparables are sparse.
The Scale plan at $199/month supports up to 10,000 active eBay listings — the highest capacity tier, with priority support. For an auto parts seller with 6,000 live SKUs, that's roughly $0.033 per listing per month — a rounding error against eBay's ~13.6% final value fee on every sale. Set a hard floor on each listing (your landed cost + eBay fees + minimum margin), and Undercut handles the rest. Pay annually and get two months free, dropping the effective cost to $166/month. No per-transaction fees, no percentage of revenue taken — a flat subscription regardless of whether you sell $20,000 or $200,000 that month.
Auto parts margins vary enormously — a $4 cabin air filter and a $340 alternator need different floor logic. For each listing, your floor should cover: landed cost (product + shipping to you), eBay's ~13.6% final value fee applied to the full sale price including shipping, the $0.30–$0.40 per-order fee, your outbound shipping cost, and a minimum acceptable margin. Undercut never sells below that floor even if it means not winning the lowest price spot. This matters in auto parts because a race to zero on commodity filters can wipe out an entire category's profitability. The floor-first design is the core feature — the repricing is only useful if it can't accidentally destroy your margin.
StreetPricer and RepricerExpress both support eBay Motors and have more configuration options — channel groupings, complex repricing rules, marketplace sync. If you need multi-marketplace repricing (Amazon, Walmart) alongside eBay, or you have a dedicated pricing analyst who will configure 20-rule strategies per category, those tools make sense. Undercut is the right call if you want a simpler setup, a lower monthly cost, and the floor-first guarantee without learning a complex rule engine. The 14-day Starter trial requires no card, so you can test it against your actual catalog before committing. Honest assessment: at 500 SKUs or fewer, any plan works; at 5,000–10,000 SKUs, the Scale plan is where Undercut is specifically built to perform.
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Can Undercut handle eBay Motors fitment listings specifically?
Yes. Undercut reprices any active eBay listing, including parts and accessories with vehicle fitment data. It compares against other active listings for the same eBay item, so the fitment-specific title and compatibility data your listing carries is what drives the comparison — not a generic keyword match. Fitment mismatches in competitor listings don't pollute your reprice logic.
I have 8,000 auto parts listings. Which plan do I need?
The Scale plan at $199/month covers up to 10,000 active listings. At 8,000 SKUs that gives you 2,000 headroom for catalog growth. Scale also includes priority support, which matters at high SKU counts where manual oversight isn't practical. (Reprice frequency is 15 minutes — the same as Pro; Scale's advantage is capacity and support, not a faster cycle.) Annual billing drops it to roughly $166/month effective.
What happens if a competitor lists a part for less than my cost floor?
Nothing — Undercut holds your price at your floor and does not reprice below it. You will not win the lowest-price spot, but you also won't take an unprofitable sale. The floor is a hard ceiling on how low the algorithm can go, set per listing by you. In auto parts this matters because aggressive liquidators occasionally dump inventory below cost — you don't want to follow them there.
How do interchange numbers affect repricing accuracy?
Interchange numbers mean one part number maps to multiple eBay listings under different titles or vehicle applications. Undercut reprices against the specific eBay listing it's assigned to, not a catalog-level product ID, so interchange variants only affect your reprice if they appear as direct competitors on the same eBay search results. Set per-listing floors on parts with many interchange equivalents, since those typically have more true comps and thinner margins.
Is there a free trial before I commit to a paid plan?
Every new account starts on a 14-day Starter trial — no credit card required. The Starter plan covers 100 listings, which is enough to test repricing logic on a representative slice of your catalog before scaling up. After the trial you can upgrade to Pro or Scale, or stay on the free plan (25 listings) if you only have a small active subset.
Related: Manual vs. Automated Repricing: What Changes at Scale · How to Avoid Selling Below Cost on eBay · eBay Seller Fees Explained · Repricing Without Losing Margin