Yes its available here in the UK, but I guess they don't ship to other countries well as they are living and delicate.
I have used predatory mites with plants and they work 100 percent and with one dose. As long as you get the right number and with a quick delivery so they are mostly still alive.
I would use them for any snake mite outbreak as my first choice. Chemicals can cause neurological issues if not perfectly balanced.
I guess they don't travel well, but Hopefully they will be bread in other countries soon so we can all get local supplies. that's unless thy could be invasive. They like high temperature's, so they would not survive in the UK outside.