Are there domains suited for e-commerce or product sites?
Finding them
E-commerce isn't a separate product tier, and it isn't reliably a filter either: category is only published where a domain's archive record makes its subject matter clear, so browsing by category will miss most of what would suit you. Look instead at the sources linking to a domain, and at its keyword themes where present. A domain linked from shopping guides or product-review contexts suits a retail site better than a higher-scoring one with unrelated history.
Why history matters more in competitive categories
Product and category pages compete against retailers with years of accumulated authority. A domain with genuine aged history and real referring domains gives a new store something that's hard to build quickly from scratch: a track record. Our guide to SEO for e-commerce covers the rest of the picture.
What to check before buying for this use case
Weigh topical relevance alongside Revised Score, not instead of it. Check the archive record too. A domain that was a real site for years is a better foundation for a store than one with thin coverage and a strong link count.
It won't do the work on its own
A domain is a head start on authority, not a substitute for product pages that deserve to rank. Treat it as one input alongside the fundamentals.