Updated Aug 19/19
We have display models of most GoPro Accessories in the store for testing.
GoPro Jaws Flex Clamp - $73 - in stock
Clamp your GoPro to objects ranging in size from .25" to 2" (.6cm to 5cm) in diameter. Attach your camera directly to the clamp for low-profile mounting, or use the optional neck to achieve a wider range of camera-angle adjustability. Jaws securely grips irregular shapes and super slim objects thanks to its innovative design. Quick release bases make it easy to move camera between different mounts and locations.
Joby Action Clamp with Locking Arm - $35 - special order
Note: with a GoPro tripod mount you can out a GoPro on any clamp with a 1/4-20 thread. Find more clamps here