Thanks for sharing Vintage Wheels. I work for the site. We just launched last week so we're happy to see people using the site to check out cars. Yes, some of the prices are a little high, but you can narrow down your search by price. Here is a search for Z's that cost less that 12K: https://vintagewheels.com/r/1qP3Vzl
You can also make an account and get new listings sent to your inbox. If you have any questions. Let me know. Thanks.