We've never seen an official price for Dell's Streak 7 tablet, but we can now readily guess what it will be -- thanks to T-Mobile's website, which is now two for two. You see, the wireless carrier typically lets you pay for devices in monthly installments rather than one lump sum, and StreakSmart discovered the former number is already printed below. As we're sure you've already discerned, that means four easy payments of $82.50 will buy you the
