Here are some of the shoes I've found at thrift stores over the past several months:
From left to right: Brass Boot loafers $5, Nordstrom bucks $10, Nieman Marcus suede monks about $12 I think, Brooks Peal $15, RL Polo handmade $10.
The Brooks Peals are marked a size 10 and from the outside the seem much larger than that. They are just a tiny bit snug on the side of my toes. I normally wear a 10 1/2. At first I thought they were too clunky, but I am getting more used to them.
The shoe trees inside the suede monks are from Nieman Marcus and I think they are relatively old. You push down the Nieman Marcus logo and you can adjust the trees for different sizes. I got them at a charity sale along with about 4 other sets of shoe trees for 50 cents each.