In Italy they cost around 500€ for not perfect cars and at max 1.500€ (but it's a really high price) for almost perfect exemplary:

http://www.subito.it/auto/fiat-regata-70s-torino-19807927.htm
http://www.subito.it/auto/fiat-regata-treviso-12188443.htm
http://www.subito.it/auto/fiat-regata-70-auto-d-epoca-salerno-19100731.htm