Which one(s) did you try? I think Plebeian Market and Shopstr are the main ones, but I prefer to have my own space (e.g. Shopify over eBay). I like what nostr:npub1nkmta4dmsa7pj25762qxa6yqxvrhzn7ug0gz5frp9g7p3jdscnhsu049fn is doing.