There’s a new low-cost spherical camera on the market called “360 Pro”.
It’s good that it’s spherical and the distance between the lenses is very small, but I really don’t understand its resolution. Equirectangular videos need to have a 2:1 ratio such as 1920 x 960. This one has an unusual 5:4 ratio. I’m not sure how you can view that. The sensor is also tiny, which likely means that images will be noisy.
For the adventurous among you, it’s available on eBay from several vendors for as low as $99: