Many classic / vintage car businesses sell 600w.
As for buying, there is a huge range in asking price, as well as a huge range between asking and actual sell price.
There are a ton of cars in the 15-25k asking price, some are ridiculously over priced and some are show and high point cars not that practical for regular road use. You can get a good driver in the 10k range. Not perfect but more or less complete and reliable with regular tinkering.
Get in touch with your local club, they will have leads in cars for sale as many members are unfortunately downsizing or passing meaning more and more cars for sale. They’d also love to have a new member even if you don’t have a car yet. I can help you find a local club. PM me if you want more info.
View attachment 722473