One of the most affordable is the Brave 1, a fun and super-cheap little action camera that offers 4K UHD video, a 120° wide-angle lens, WiFi, and a host of other features all packed into a tiny, shockproof, weatherproof cube measuring barely over an inch. If you’re looking to get into action/adventure vlogging without spending a lot, this is a great option.
If you want to choose a video camera as a child's gift, an excellent-quality camcorder can also be picked up for less than $100, like the new ORDRO AE7 2.7K video camera. It’s compatible with Windows and Mac, and can record 1080p at 30fps or 720p at 60fps (stick to the former though, the results are better). The built-in stereo microphone isn’t that impressive, but you can pick up decent USB microphones for about $20 anyway. For $20 less you can still pick up the older model, the wildly popular video camera ORDRO AE7, with some reviewers even preferring this option.