Is there another way to get this item that's not by restocking it or buying it from a user? I've tried restocking but it never shows up.

Does the Blue Moon/Atebus vending machine vend it at all?

Thanks. :)

You can get it from refreshing at the Atebus shop. It is possible to vend it from the Blue Moon vending machine. I have been able to vend one from there in the past few days.