For people also interested in a Copper International, 1974/5/6 era, I know of one for sale at "Bikeworks" in Urbana Illinois (no web site but the web site is : (217) 328-2001 .) The shop owner Bruce Krueger showed it to me last christmas and the asking price, for a 22.5" bike, was $450 (shipping extra, but bruce is a very reasonable guy ..) Bruce is a great guy who has been running this one-man shop for about 20 years.
It was in above average condition for a bike 30 years old, but not spectacular. If memory serves me, everything was original except for the rims.
- Don Gillies
San Diego, CA