Anyone know where I can buy this

You can’t.

More info here: https://www.muffwiggler.com/forum/viewtopic.php?t=156490

Yep. Feel free to drop me a message if you are interested in ordering a set, I should be able to start shipping next week.

Update: The guy is making some now, check the link at MuffWigglers

Edit… see above post.