Maybe Craig's List or Gumtree could be somewhere to trade?
My advice would be to stick with forums. At least you have a pretty good idea who it is you're trading with. I've done a lot of trading via here and other forums (mostly the Pre-cert site) and have only been ripped off once and that was years ago on another site. People are good on the whole, there are a few bad apples here and there, but they're a very tiny minority.
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