Buying used, you are at the mercy of what's for sale, unless you can afford to wait. Search for the usual suspects on your local CL. Your market seems pretty small (just looking at the bikes section, Columbia has 236 ads and Sacramento has 2016). Maybe you could look at the CL for Charlotte or Atlanta. On top of that, touring bikes are pretty rare compared to the mountain, racing, and cheapie road bikes you'll find dominating any local used market. They're not made in so many flavors and I think people tend to hang onto them.

Hey, here's a cool bike. Not steel though
https://columbia.craigslist.org/bik/4917363028.html