If you have the Insta360 Nano (reviewed here), the Nano Mount tripod adapter is a very useful accessory (check out my hands-on review and test here). It had been available in September but at scandalous prices (currently $77 + shipping). Fortunately, it is now in stock from an Amazon reseller for $36, with free shipping.
Amazon itself is also offering it for preorder at $30 but with an unknown delivery date.
The Insta360 Nano (reviewed here) is a fully spherical 360 camera that attaches to your iPhone to make it easier to control the camera, view 360 photos and videos, and to facilitate sharing to social media. It provides very good image quality and best-in-class livestreaming.