I have 2 AKASO action cameras that are surplus to requirements. Both of them come with waterproof housings, 2 batteries, a remote control, charger and cable, and I can add a couple of mounts for each one. Each camera will come with a 32GB Mini SD card, so you have everything you need to get started.
Camera 1: AKASO EK7000 4K
Camera 2L AKASO V50 Pro (SOLD)
Neither has been heavily used
£35 each, or happy to take a reasonable offer for both.