I've noted that several dealers on here list sales of "trade in" machines. It won't hurt you to ask! Most all the dealers sponsoring Tnet are very strongly vetted (= trustworthy!).
I would trust any dealer on T-net. I have never heard of anyone having a bad experience. One guy might be 1 or 2 percent lower than someone else but one must also consider quality of service
Excal 1000, Excal II, Sovereign GT, CZ-20, Tiger Shark, Tejon, GTI 1500, Surfmaster Pulse, CZ6a, DFX, AT PRO, Fisher 1235, Surf PI Pro, 1280-X, many more because I enjoy learning them. New Garrett Ca