Longshot deal: find a PS2 harddrive, which were going for peanuts at TRU and Sears. Odds of finding one are very slim, but you never know. You can store a ton of PS1 and PS2 saves, and need only one PS1 and one PS2 memory card.
Target is clearancing the Sony brand PS2 memory card two-packs now. Best price I've seen so far is 33.99 (I think) but there are enough of them that it'll go cheaper.