In a surprise move perhaps inspired by iPad discounts at various other retailers, cellular provider AT&T has announced an online and in-store tablet sale, taking $100 off a selection of 7-inch and larger Android tablets as well as various iPad models, including the iPad mini. The deal is contingent on signing a two-year data plan, but does include a rare price break on the current-model LTE Retina iPad and LTE iPad mini at all size options.