Amazon is selling every smartphone it carries (except the iPhone) for one cent, from now until Monday, when buyers sign up for a new two-year contract.

Among the smartphones being offered in this pre-Cyber Monday sale are the Motorola Droid Razr 4G, the Samsung Galaxy S II 4G Touch.

In October Amazon listed all its Verizon phones for one penny, with the notable exception of the iPhone 4.

Android devices are quickly outpacing iPhones as the most popular category of smartphone in the world.

One of the reasons is that Android phones are frequently offered for very low prices. By contrast, Apple is slow to discount its products, which might account for why Amazon’s one cent sale doesn’t include the iPhone.