In the US, you can ship using Greyhound bus lines. I wouldn't recommend it for this scenario, but I know people that ship auto parts around this way. Ship up to 100lbs for some incredibly cheap rates.
Over $20 for a 1 lb package, over $60 for a 50 lb package from Oakland to Los Angeles and a quoted time of four days station to station.
I can overnight a 50 lb package for $35, door to door, over that distance with the appropriate FedEx account and discounts. The ground service would cost me $30 without any discounts...