Campark action and 360 cameras
Campark has 2 cameras in this catalogue, priced from ~$69 to ~$89, across one type. The largest sensor in the lineup belongs to the Campark V40 at 28 mm², and the cheapest is the Campark V40 at ~$69.

Campark
Campark V40
Cheapest dual-screen camera in the catalogue, and the front display is the only reason to pick it over Campark's own X30. At $69 it does the basics: native 4K30, 20 MP stills, 10 m of bare waterproofing — which several cameras three times the price do not offer — and a 40 m case for anything deeper. Everything about the image is what the price implies, and the list of things it does not have is long: no horizon lock, no log profile, no published bitrate, no 4K slow motion. It is a camera for a pool, a first bike, or a second angle on a trip, and nothing about it pretends otherwise once you get past the packaging.

Campark
Campark X30
Sold as a 4K60 camera, and the spec sheet on Campark's own site quietly says otherwise: native 4K is 3840×2160 at 30 fps, and the 60 fps mode runs at 3200×1800 — upscaled to look like 4K in the file. That is worth knowing, because it is a pattern across the sub-$100 tier rather than one brand's failing, and it is the reason this catalogue records a native resolution and frame rate rather than the box copy. What you get for $89 is a competent daylight camera with a touchscreen, two batteries, a 40 m case and standard GoPro mounting. Electronic stabilisation cannot run alongside distortion correction, so you pick one. The card ceiling is 64 GB, which is low.