Selling computer hardware outside of eBay (eBay alternative)

The computer and electronics sections of eBay might be one of the biggest scams every to appear, the sellers locations are off (drop shippers etc), the “untested item” (translation: f*cked), not actually sending it and all other manor of issues plague that particular area. I found this on Reddit real people swapping/selling real things lots of US but some UK and others in there.