I would agree also on buying a decent detector.If you want your son to be interested in the hobby,buy a detector that will enable him to locate, and also if he is not interested this would give you a back up, plus if you have a friend that is interested in the hobby you could let him use it with you,Alot of people talk highly about the ace 250.Your going to spend around 225 depending what and where you purchase.What type of detector do you currently use,and type of location do you detect,has a great bearing on the decision you choose,Good Luck.Also TonyinCT would be a good starting point,Ronald99