I would start with the Chalet collection and the HouseGothic collection along with a few others including Powerhouse from House Industries.

As far as finding free ones, have fun finding then on your own at www.dafont.com.

Larabie has a number of free fonts that look like they could be from the 70s.

- Lex

Doesn’t get any better than Fontalicious:
http://www.fontalicious.com/

Try these free and fabulous inlines...

http://www2.wind.ne.jp/maniackers/millennium.html

http://www.fenotype.com/font/fontpage.htm