Here's a few places that popped up with a search.......

Here is a link that might be useful: Bacillus

I got mine at Home Depot last year. It is in a little white square looking bottle (8 oz) with a green and yellow lable. I asked a lady and she took me right to it. Guess they use it for Orlander worms also.
Says:
Southern AG
Thuricide HPC
Only cost about $4 something. It worked well but I did have to use it several times. I got two bottles but never had t use the second one.
Sky~~