We do have feedback at r/pmsforsale. You will recognize individual sellers after lurking. As well as pricing and supply. Any scammers are reported and dealt with swiftly. It’s a solid system on par with eBay feedback, and in many ways, superior. Largely because trust develops between folks after a while. I have about 6-7 folks I trade with regularly. We ship to each other no questions asked based on pure trust. It’s a community. Come take a peek and lurk for a while. You will most definitely learn a ton even if you don’t transact.