DLC for this game is only 400 points ($5).
That said, fun and mostly enjoyable game. Not that difficult to get the full 1000 gamer score if you're into that sort of thing. Didn't bother with the DLC though since I felt I "full" with the game when all was said and done.
The DLC adds one extra level that's of a decent meat size, a survival mode, and the extra costumes/cheats. It's a decent pack if you want another scoop of DTRR.