Acer Chromebook C720
Chromebooks aren't for everyone, but they're good gifts for those who don't need a full laptop all the time but don't want a tablet. The Acer Chromebook C270 is one of the best laptops running Google's Chrome OS at the moment. It can only really do a few things (Internet and web apps), but it does those things very well for such an inexpensive machine.
The Acer Chromebook starts at $199.