Originally Posted by bykemike

eBay, just about all of my current 6. I look for buy it now deals with the best offer option. There are hundreds of frames and they usually are well photographed with an accurate description. Shipping and taxes add a bit though.

Originally Posted by acoustophile

If you have a bike co-op in your city they usually have old 10 speeds that are good candidates for conversion.

Originally Posted by rumstove

I know you mentioned Craigslist, but that's my go-to place when looking for old bikes and parts. CL has "bikes" and "bike parts" sections...be sure to check both since people will post random stuff to both. Yeah, prices have gone up because people hear how everyone wants bikes now so they suddenly think their old bike is worth more than gold but there are some decent priced finds out there too.

Congratulations on the recently finished Super Course conversion...sounds like a fun bike to ride.

Originally Posted by Lazyass

Have you looked at facebook marketplace? Where I live I'm starting to see more bikes for sale on that than CL, that's the only reason I even have a FB account. There's also Offerup, I actually first saw that site a couple of weeks ago.

https://offerup.com/

Originally Posted by TugaDude

I've noticed in my area that Craigslist have definitely gone downhill with regard to quality bikes. The only decent ones seem to be either unpopular sized-frames or newer bikes and many are overpriced in my opinion.

Having said all of that, I'd be looking for a mixte frame for a conversion. And if Craigslist is not yielding results, check bike co-ops as suggested and also Goodwill and similar. Hopefully a good candidate will appear.