Not sold at retail, but you can browse SmallRig
Some links here are affiliate links. If you buy through one, Creator Gear earns a commission, at no extra cost to you.
Creators cited with this

NigelBarrosYouTube, 163K followers“This is a small rig npf Battery Plate and I just have it attached to a little cheap monitor mount which has a cold shoe”
Watch the video at 4:22
Creators who use this also use

SMALLRIG Quick Release Mini Top Handle NATO Handle Grip - 2770
also used by 1 of them
SmallRig Quick Release Safety NATO Rail (1409)
also used by 1 of them

SmallRig shock mount
also used by 1 of them
SmallRig Short Rosette Arm
also used by 1 of them

SmallRig Shotgun Microphone Holder (Cold Shoe) BSM2352
also used by 1 of them
SmallRig Side Handle
also used by 1 of them