I haven't bought or sold a guitar/bass in years. I am getting rid of some stuff on Ebay (before the new fees kick in), and I am trying to calculate my shipping costs up front. I found FedEx to be the cheapest and easiest to use, but they have destroyed an amp I shipped once. Granted, they did put out the full insurance amount. FedEx? UPS? USPS? Any online stores were I could buy boxes (with no minimum order)?