Scrotum Lab's adaptation for BugBrand Modular
Built and calibrated for BugBrand Modular -15V/+15V power supply, but will work just fine with -12V/+12V too.
Also compatible with BugBrang new powered frame version (nov 2015).
https://www.youtube.com/watch?v=6j3okBHKv3U
No info about availability.
$395