Original Brand New Copy of Hot Shots Golf Open Tee for the PSP.
Bought the game in anticipation of getting a PSP but just couldn't justify the cost of the system when it was at it's most popular and while I'd still love to get one now the price is pretty much the same and I can't justify the extra cost of a new system and games.
My loss is your gain.
The game has great ratings and has had fantastic reviews.
http://www.metacritic.com/game/psp/hot-shots-golf-open-tee