Dan,
I fully understand. At bicycle speeds: "Disc brakes...oooh! pant, pant drool!" At motored bicycle speeds well, I'm not so sure. Right now I'm leaning toward sticking with rim brakes of some sort. What sort, however is a mystery.
Alaska,
No bike shops and no junk yards that will let you salvage. I'm keeping an eye on some of the second hand shops and garage sales but nothing has turned up to date that looks usable. Good idea, though.