
Have you been to Randy Ayers site yet?
The thing is, a lot of these guys make their own decals, or pay to have them made. And in some cases it is not cheap. But they want a certain car and are willing to pay the price.
I would avoid most vendors you might see on Ebay with "cheap" decals. Because the quality is the lowest you will find. I had a stack of decals that I just threw away because unless the car was white, they were useless. Horrible bleed-through to say the least. I can make decals too, but nothing I can make will look anywhere near the quality you see on that Nova.
I think you should join that forum and get to know some of the folks. They get a lot of requests but will respond to those who are serious about a project.