Hm, having acquired multiple treadles and been all over Craigslist for my state and neighboring, I can tell you this fact, prices range from 'come take, to d@#% ridiculous.
A machine's worth is based on how much you want that particular machine. Everything else is second. Because I had an 'eagle eye' and spotted a cabinet buried under magazines and tools, I became the owner of an almost pristine Singer 66, Red Eye. You can view it here -
http://www.quiltingboard.com/vintage...y-t177583.html We paid $40 for her.
If the pin rash and missing decals are of no consequence to you, and the machine is in working order and you want it, go for. Otherwise, hold off. Red Eyes are a dime a dozen.
Good luck with your decision.
best,
d