Comc and Ebay are the usual options for buying baseball cards, but it pays to get off the beaten path some times for baseball card buying options.
For instance, I bought some cards from Kit Young a month ago. Kit Young has been around for a long time, so he isn't exotic, but he isn't the knee-jerk option like Ebay.
This time I bought from a site that specializes in O-Pee-Chee cards, OPC baseball. I bought 4 cards from them; ironically, only one was actually an O-Pee-Chee card.
First I got 2 cards for my 1959 Topps set build: Drysdale and Hodges. Neither of them are in great condition, but they're both totally acceptable to me.The backgrounds are interesting too. It felt good getting 2 hall of famers out of the way. I now have 56 out of the 572 cards in the set, which isn't bad considering I haven't been actively working on it for that long.
This was my favorite of the lot, both just as a card and as a deal. It was just $5, a real steal for a vintage Whitey Ford, and I also just really like the card. 1964 Topps has a nice design, and I like the pitcher-coach designation. Not something you see everyday.