Tablet sales through carriers have never been particularly hot -- the majority of those sold are Wi-Fi only, with customers uninterested in paying a steep premium for data or in a contract -- apparently even if some of the up front tablet cost is reduced. Verizon recently announced that they'd no longer be selling users subsidized tablets, and now AT&T appears to be following suit. Leaked company documents obtained by Engadget suggest that AT&T stopped selling subsidized tablets as of yesterday, though they'll still be selling tablets at full price. The memo also indicates some changes to AT&T's DataConnect mobile broadband services. As of yesterday, stand alone data prices for tablets were lowered by $5 each, with new data plans at 250MB for $14.99, 3GB for $30, and 5GB for $50. Or, users can connect their tablet to their existing shared data plan for $10.