hey rfisc2170, Im in a similiar predicament. Some Dbag hit my bumper in a parking lot and messed up the whole allignment of my bumper as well as slightly cracking some of it. Needless to say i hope he gets hit by a car himself. regardless i just looked up the price for the bumper and its roughly 500$. They have 3 different options though, one for base/touring Z's (no year specified). 1 for Nismo's up till 13' and then 1 for nismos and 14' model or newer. heres the link to nissans website where i found all the info
Nissan USA eStore
hope this helps. Its a little confusing on the site but they have all the parts there.
-KB