I bought GT4 and a PS2 Memory card when it first came out from EB and I got rid of my Slim PS2 and just held onto the games. The memory card has only been used to save one game of GT4 and is 23% through the game with some cars and cash. The game is in mint condition.

If you haven't bought it yet I'll be willing to sell them as a set (preferred) or seperately Free Shipping either way:

Gran Turismo 4: $42
8MB PS2 Sony Memory card: $18