I ran across this web page once after I purchased my TM:
http://www.camperfinds.com/trailmanor-trailers-for-sale
Doesn't look like everything is there, but it looks like it does pick up those on Craigs List.
Also, have you seen a TM in person? The tipping point for us was going to an RV show and actually seeing one and how it worked. A TM was the only camper we considered in our search.
Good luck in finding the perfect TM!