Welcome to airforums.com, snoboy. The classifieds here are a good source, but so is craigslist. It can be worth keeping an eye on as well, since the usual way to use it is to look for local buys.
I understand the kijiji.com was converted to some new flavour of ebay.com now, thankfully it is still stand alone up here.
Oh, I see that Ortonville is somewhat of a distance from the larger cities, so I guess that you're not going to be afraid to go looking afar for a trailer.
Any how, good luck with your hunting, and have a wonderful 58th!
“Courage is being scared to death, but saddling up anyway.”