Sony Xperia tablet saleToday is Presidents’ Day and that’s reason for celebration not only for Dell, but also for Sony. The latter isn’t exactly as generous as the former, but we still have awesome news for folks that are in the market for a decently priced 10-inch tablet. The Xperia Tablet S, released less than five months ago, is now just $399.99 in the 16 GB flavor. That’s $50 off the list price, but the savings don’t stop there. Sony’s store also throws in a free “casual cover” (regularly worth $59.99) with every Xperia Tablet S order, bringing the savings total to $109.99. Not too...