T-Mobile recently dropped its prices on two popular Android-powered devices from Samsung. The Galaxy Tab, Samsung’s first Android tablet offering, is now available for $349.99 with a two-year agreement; down from $399.99. The popular Samsung Vibrant, T-Mobile’s version of the Galaxy S smartphone, dropped from $199.99 to $149.99 on contract. These new prices appear to be permanent adjustments rather than temporary sale prices, and may help bolster sales as the final weekend of the 2010 holiday shopping season approaches.¬†Sales of the Samsung Galaxy Tab recently passed the 1 million unit mark and inevitable price drops will likely help the device maintain an impressive sales pace. T-Mobile is the first U.S. carrier to drop the regular selling price of the tablet, and it now touts the lowest on-contract price for the Galaxy Tab in the country.