The Surface 2 LTE will be available for purchase in the US via the Microsoft online store and brick-and-mortar locations, as well as from Best Buy. The device will ship unlocked, and users must activate the LTE capability by signing up for an AT&T data plan or associating it with an existing AT&T plan. The 64 GB Surface 2 LTE will retail for $679 without the optional keyboard cover, which can cost an additional $80 to $200 depending on the type. The price represents a 24 percent markup from the original 64 GB Surface 2, which retails for $549. Read the full details here.