shoes can be expensive because of the box / weight. priority can be costly for that, and any slower speed by USPS sucks (can't do first class because of weight). i'd say fedex or UPS ground would be cheapest there. if the clothes can fit in to a USPS flat rate box that's normally what i'd do. for t shirts i stuff them in the USPS priority envelop which is like $6...but whatever, it's cheap enough, gets there fast, has tracking and is more convenient for me.