Why do you want to ship flies? you get 2 different cultures to start with and fruit fly media - I am usually getting repashy super fly from northern gecko the biggest tub, free shipping for 100+ orders. And then you just culture as many as you need. 32oz cups you can get from the same northern gecko or superstore wholesale, lids - I got mine in bulk from northern gecko. If you buy flies and not culturing them you will go bankrupt fast enough. you can even make your own media, but I don't like doing it ( personal preference).
Understory enterprises - one of the biggest breeders in Canada. Look at their website - they always have at least half of these frogs in the pictures, email them for availability. They have plants too and awesome moss that I need to get more of again.
I suggest you ask the same question on fb groups I mentioned, you will be set up in no time! And your main dilemma will be how to choose the ONES lol