can't find portal :(

Hey guys! I have a question. My brother recently got a PS3 and he's been shopping for games for it. I suggested he buy Portal and showed him some gameplay and stuff, and he got excited and put it on his list of games he wants. Well, we've looked just about everywhere and couldn't find a copy of Portal. Amazon, Ebay, Gamestop-we even tried Craigslist and no one has the game. There's Portal 2 and there's the Orange Bundle, but no standalone PS3 copies. Why is it so rare? Is there somewhere we haven't looked that we should try? And if there's just no way of getting the game, would it be terrible to skip to Portal 2? Also, if anyone has PS3 recommendations we'd love to hear them.
Thanks!

End