Where do you guys rent games? You can buy it on Amazon for less than $10. My only rental place is Blockbuster and they charge close to that for a 3-5 day rental.
In any case its worth buying in my opinion. Great storyline, great graphics, great music...very love it or hate it gameplay. If you don't know anything about it, I suggest watching some gameplay videos of it to get a feel for the detective work because that's the crux of the game. The movement, shooting, and driving mechanics all have a GTA IV feel.