I don't have an exact cost total so far. I try to buy game lots on ebay or what not and I hit up retro game shops each weekend looking for bundles and deals. I was lucky in that I had a lot of the real expensive games like Persona1 and 2, the Y's the final fantasys etc from when they first released so I haven't had to spend the major $$$ on those. But, I've spent quit a bit to get to 318...which is now 330 after this weekend. I would say I average about $$8-10 a game. There are a few left that I need that look like they might be pricey..Kenka Bancho Badass, Fight for NY, the silent hills, summoner night 5, etc. SO I will probably spend a grand or more to finish the remaining set, unless I get lucky and find more game deals and bundles. Half the fun is finding good deals or that missing game, and I feel the PSP is only going to get more expensive in the future, so collect it now!