You mean buying/selling stuff with Bitcoin ?
First you can use: https://stacker.news/~AGORA
Then others:

• http://agorist.market/
• https://satstash.io/
• https://scarce.city/
• https://plebbin.com/
• https://www.oshi.tech/
• https://t.me/bitcoinp2pmarketplace
• https://plebeian.market/
• RoboSats - you can put any offer for sats
• https://tukan.market/
• https://farmfoodmap.org/
• https://bitejo.com/
• https://miragesale.com/
• https://bitify.com/
• https://paid.co/
• https://mobazha.com/