Have you considered listing the items on the Nostr marketplace protocol?

This is definitely the easiest way to sell items for sats.

Otherwise, you're looking at a basic ecommerce site + an integration with a bitcoin/lightning platform, along the lines of something like https://www.oshigood.us/

A freelancer would be able to handle this. I couldn't say how much someone would quote (I would need to spend a little time on it to quote it myself) but I would imagine it would be under a few thousand dollars. Again, the best place to ask around for these services would be nostr. And, once it's finished, https://catallax.network is intended for exactly this sort of thing!