This isn't necessarily for cards you can use, but you may get some $$ you can use for new ones. I've usually just lumped into player lots and used Ebay. I know you may not get huge $$ for them, but when I was doing a lot of those types I was getting almost $40 a week through around 10-12 auctions a week.
If you find something else that works, lmk as I'm sure most of use are in that boat.
