Given that full-featured tablets like the iPad, Amazon Kindle Fire HDX, Samsung Galaxy, Microsoft Surface, Google Nexus, LG G Pad, Sony Xperia, and others aren't cheap, it's no big surprise that a lot of parents are somewhat reluctant to turn one over to a child. We worry _ understandably so _ that the cute little kid in the backseat will either break it, go on line and browse inappropriate content, or buy stuff we don't want them to have. This week we take a look at four tablets that are fun enough to keep the kids entertained, yet safe and cheap enough to keep mom and dad from pulling out too much of their hair. All are Android-based, wi-fi-enabled, 7-inch touchscreens that come with a protective sleeve to protect against drops, as well as a number of ports, which may include mini/micros USB, SD, and HDMI. These tablets also come preloaded with a selection of kid-friendly games and apps, and parental controls. But let's talk about the differences.