Available for as low as $139, Amazon's original Kindle Fire HD is a great deal for parents. Like the Kindle Fire HDX, the Fire HD offers Amazon's excellent FreeTime mode, which lets you set individual profiles for each of their children that limit how many hours they can use the slate. Parents can also set what apps their kids can use and which they can't. Beyond that, children get access to Amazon's massive library of books, movies and TV shows that should help keep your kid occupied during long car rides. The 1280 x 800-pixel HD screen and 1.5-GHz dual-core CPU provide a very good experience for the money.