Greyhound Package Xpress. Take em to a greyhound station. Not only is it cheapest, but there's no machinery involved like at FedEx/other places, so the chance of them getting damaged is lower. At Greyhound, a person loads them on the bus, then unloads them at the destination. At FedEx, it's all machines that have hooks and sorters and stuff... plenty of opportunity for them to get bonked around.