The Galaxy S5 is already available for preorder from many carriers in the U.S., and will be available in stores in a few days, but interested buyers should check Target and Best Buy’s new offers that may help them score a cheaper new Samsung flagship handset, especially if they plan to buy the handset on-contract. Target is currently offering a “guaranteed $100” discount on the Galaxy S5, but the deal has some conditions. First of all, Target will require buyers to ink a new two-year deal with either ATT, Sprint or Verizon. Secondly, they’ll also have to trade-in (online or in a Target store) a working smartphone in order to get the discount. The company will throw in an additional 5%