The first thing that came to mind for me was a sky viper or sharper image drone. I know that they are hardly any good and are toy grade, but some of them may have cameras. I’ve seen them in Walmart before. I have heard of a drone called a “beast” (I forgot the designation) which is around $200 with a 3 axis gimbal. I have a friend who owns one and he says it works really well. Not sure if your friend is going to find much under $100?

best of luck though!
Forgot to mention this: I bought a drone a couple of years ago on Amazon called a Visuo (once again forgot the specifics) but it was around $80. Flew well and had a 720p camera.