Tiny Whoops are cheap quadcopters with FPV capability. They are a lot of fun to fly and I highly recommend them to anyone wanting to get involved with quads! You can see a video of it flying here.
RC Car built for a UQ Robotics Hackathon
As part of a UQ Robotics Hackathon, we bought $15 remote controlled cars from Kmart that had shockingly bad range (only ~2 metres). So we had a hackathon to make them better! I used the NRF905 ISM band radio (430 MHz and 900MHz radio) to control the car. I made use of the LM317 breakout board that I made for a UQ Robotics PCB workshop to power the controller and the FPV camera on the car. Check out a video of the car driving here!