in the form of a mail-in rebate. In other words, the 16GB version of the phone in white or blue will be $199.99 after the rebate and the 32GB variant will be $249.99 after the rebate. But this means that if are a U.S. Cellular customer and want the device, you will be laying out $299.99 or $349.99. Considering that many carriers have done away with the whole rebate thing, U.S. Cellular's actions here seem so five years ago.
Bottom line is that all of the U.S carriers that are now set to deliver the Samsung Galaxy S III at the same price for each model. The only difference seen thus far is the lack of the 32GB unit for AT&T which is also getting an exclusive red model.
source: U.S.Cellular via AndroidCentral