ASUS' PadFone 2 may be the only notable contender in the phone-in-tablet space, but it does have a cheapo me-too in TransPhone. The latest "Pro" version of this budget hybrid comprises a 7-inch 1,024 x 600 TransPad dock, which swallows up a 3.5 inch 960 x 540 smartphone powered by a dual-core 1 GHz MediaTek chip. The set carries a $240 price tag on pre-order, though since this company doesn't have much of a track record, you may want to hold on to your cash until it becomes a real entity sometime in March 2013 -- even if it'd set you back an extra $50 at that point. There are more details in the PR, if you're up for a gamble.
Source: TransPhone International