Wal-Mart prices work in the same fashion as well. The price you initially see is for a new contract. Select "2-yr service contract renewal" under "Pricing Options" on the product page to see the upgrade price.
Current lineup: Galaxy Note 2, Galaxy Note 8.0, MotoActv
Previous smartphones: Galaxy S3, One X, Droid RAZR MAXX, Galaxy Nexus, Rezound, Galaxy Note, iPhone 4S, Droid Bionic, Stratosphere, Droid Charge, Vitality, Droid Incredible 2, Thunderbolt, Palm Pixi Plus, Droid 3, Fascinate, Droid Incredible, Droid Pro, Droid 2 Global, Droid X, Droid, Treo Pro, Touch Pro 2, Touch Pro, Q9m, XV6800, XV6900
Previous tablets: Transformer TF300, Evo View, Transformer Prime, Transformer TF101, Thrive, gTablet