You just want the frame? They rarely pop up on CL, so my advice would be to buy a whole bike and sell the extra parts you don't want. You could also look for bikes that aren't in ready to ride condition- those should go for a decent discount. This '85 Tempo for example:

Schwinn Road Bike made in Japan Classic for sale - $80 (East Campus)

https://austin.craigslist.org/bik/d/...924693114.html



I have no clue what size you ride though.