EBay, Collectors, Flea Market & Antiques

I would first try to get a sense of their age since older ones are usually worth more than newer ones. Then I'd separate out the rookie cards and the cards of well known players. Then I'd go on ebay with those cards and search completed auctions to get an idea if you have anything of value. After you have an idea of what you've got, I'd haul them to a sports card dealer and see if he wants to make an offer. If you stumble upon anything of value, you might want to send it away to be graded and put it in an auction. Personally, I hate the things but I always buy them when I see a bag or box for sale at a tag sale or thrift shop. Right now I've got a bag I bought for $2.50 that I'm procrastinating about sorting. Good luck. Hope you find a Honus Wagner.