I'll put in a plug for the B/S/T. I sell a little on ebay as well but I normally put things up here on the Buy/Sell/Trade section first. You can avoid all of the fees, and most of the hassle. Check out the thread where people are talking about their experiences on B/S/T to get a gauge for how it is going over there.
http://www.net54baseball.com/showthread.php?t=134967
I've sold a bunch of raw cards on ebay as well and if you are very clear about the flaws on the cards and provide large scans, you won't have any trouble.