I have a 78 Z28, and looking around for parts and such I have noticed you can find them cheap enough if you are wanting to put in the work to build it up. They are getting harder and harder to find though. I got lucky on mine, little rust in quarters and stratght body, even the floor pans weren't beaten or rusted.

 

I saw a running, driving well built '79 Z28 project car on the local Craigslist yesterday for $950. All primed out, and some missing or not installed interior trim, but a 350 and TH400 car that's supposed to be around "400 hp".
There seems to be a lot of late 70's Camaro projects cheap on CL lately. There was another late 70's Camaro that was a race car project with full cage, and 9" Ford for $750, no engine or trans.