I use the Paintball Kit Auctions to list and sell stuff all the time - new stuff and ex-display stuff. Sometimes it sells, sometimes it doesn't. The market needs something like this though so I keep listing and it's getting really busy on there now - both with buyers and sellers.
There are lots of registered members and whilst they don't always bid there's a lot of people keep checking back incase they spot a bargain. Speaking of which, I've got a jt white spectra mouthguard on there at the moment which I know isn't going to stay at £1 for long.
It doesn't cost anything to list anymore either so you only have to pay the end of auction fees if your thing sells.