Try the Miniatures Trading and RPG Marketplace forum here on Enworld. Lots of Enworld users sell or trade minis all the time. Of course there's the risk of being scammed, but just make sure the person selling them has already made deals before. I'm in the process of selling a boatload of commons/uncommons on ebay. I have some Harbinger up right now but I plan to add a bunch from Abberations & Deathknell.
If you're looking for anything in particular, feel free to email me and I'd be glad to sell you anything I have at a better price than you'll find on any online stores. We don't need to use ebay either unless you prefer. I've made lots of sales here on Enworld.
oryan1977 at yahoo.com