VIRB 360 Camera External Power Solution?

Posting here since there isn't a hardware forum for the VIRB 360. 

Been unable to locate the Garmin Powered Tripod or Marine Mount. But have found the following aftermarket item on ebay:

https://www.ebay.com/itm/165457934122

Has anyone used this thing? Or better yet, know where I can buy an OEM version?