When I was in the market for a fishing boat, I checked out a couple of places that sold used aluminum boats. I was really disppointed what was being sold as used boats. They looked like junk to me. One place you may want to call is Loyds. I would normally spell Loyd with 2 "L's" but this Loyd only uses one. They are in Mesa and he had a variety of abused aluminum boats.
If you are really stuck, I have connections back in Wisconsin.