Okay I can't be a hater and lie, it happened to me when I was in high school too, but jeez dont be such a puss, sometimes I dream about getting back at the people who jack me one way or another! Since you know where he lives go skull fuck his mom, or kidnap his dog, hit him with your car if your really that scared to approach him personally, or get a bat, make his dad give you the money (forcefully), or throw his ass in the trunk and drop him off inthe middle of the county!!!! Anything please!!!!! do it for me!!!!! Be patient first he might just be having trouble getting it and is waiting so that he doesn;'t lose out on a sale but if after a while no money, take what is rightfully yours and make sure he doesn't do it to anyone else.