These are the sites that I use to sell my items on. Yes there are others but I use the sites listed below.
Snifffr I am no longer on snifffr. They are a legit site but I decided to go with the sites that work best for me. The problem I started to have with sniffer is that people were starting to leave fake reviews. The admin team is REALLY good at getting them taken down but I personally will not deal with fake reviews from anyone.