UPS shouldn't be 30 bucks... it depends on where you are shipping them to.. UPS is around 8-10 bucks if you are shipping them less than half the country away, if I ship skis from utah to vermont it's usually around 15 bucks.
fed ex is pretty similar, and I wouldn't know much about usps.. I use UPS, because people want tracking numbers usually for skis.. usps can really only give delivery conf. numbers.