Sprint is offering a FREE $100 American Express Reward Card when you buy any smartphone with a new 2-year service agreement for limited time. Activation ($36 value) and shipping is also FREE for limited time. Deal expires August 26, 2012.

Deal is good for popular smartphones like the new Samsung Galaxy S III ($99.99), HTC EVO 4G LTE ($99.99), Galaxy Nexus (FREE), Motorola Photon Q 4G LTE ($99.99), and many more. Deal not valid on the the iPhone.