You can get PGR4 from goozex for 100 points. Which is $5 in goozex money right?
I used my last 100 points on PGR4 from goozex and someone sent me a brand new copy(probably a CAG that got a XBL bundle).
Either way, it'll stay sealed on the shelf.
PGR 4 is a great arcade racer and practically a steal at that price. Tons of cars. Tons of courses set in real cities like New York(see below), London, Las Vegas, Tokyo & more. http://www.youtube.com/watch?v=3kecyoO7KkM
If you're on the fence, jump in(pun intended) and give PGR4 a try. It will probably be the best $10 you spend on a 360 game this side of XBLA.