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MY advice would be to buy an 8mb memory card. I've seen non-official ones in SR as well as HMV and Dixons for £19.99. I think some are made by "Mad Catz" or something....
I wouldn't worry too much about not having 16mb. I've got quite a few games and in some of them, like FIFA 2002 and Tony Hawks, I've saved loads of custom teams/tournaments and custom skaters. I have a Sony 8mb memory card and the last time i checked i still had loads of space left on it.