Hi
I have bought wax worms from worm man who advertises here in kingsnake however the temp when I bought them was in 70s not summer so have no idea how they ship now but they arrived great in the winter here reg inexpensive postal(Florida).

I do know wax worms turn into moths so if flying insects don't bother you consider breeding Phoenix Worms which I read are easier and loaded with calcium and protein.

The maggot aka Phoenix Worm is cultivated in grain,etc and geckos,treefrogs,etc adore the fly and the grub.