Don't have any idea how much a used one would be,I lost my class ring many years ago and was thinking about inquiring about a detector n see if I can find it,maybe someone has already found it but it would be fun to look for it. It would be in about 3ft. of water in a lake here in Mich. don't want to spend an arm & a leg for one. any input would be greatly apreached. Barney-mi