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
Jason MorrisYouTube, 147K followers“I can still use some of my Small Rig uh adapters, you know, on there, but it's not exactly the same.”
Watch the video at 8:02
Creators who use this also use
SmallRig Aluminium Cage (SKU 6002)
also used by 1 of them

SmallRig FX3 Cage
also used by 1 of them

SmallRig Magnetic Mount (SKU 6009)
also used by 1 of them

SmallRig MagSafe Mount
also used by 1 of them

SmallRig Multifunction Cage for DJI Osmo Pocket 4P/4/3 (SKU 6003)
also used by 1 of them

SmallRig NP-F970 USB-C Battery
also used by 1 of them