I paid about $120.00 for a mint '74 Supercourse frame but then I went irrationally overboard and 'invested' about 10 times that in building it up with hard to find vintage, NOS and Phil Wood components. I wouldn't recommend this approach unless you have a few screws loose.

Some of you have seen the results, those who haven't here it is:

http://www.flickr.com/photos/58605563@N00/