PSP Memory Pro Duo 256MB
Good memory card, but...
The 256 MB memory card is an alright card in terms of memory, but DO NOT, I repeat DO NOT get this card if you plan on putting games on it. It's just too small. It's great for game saves, because they take up so little space. If you want more bang for your buck, though, get a 2 gig card.
It is not the best but it is cheap and if you buy two or three you will have a lot of space