Is zenrelia officially out?

My vet keeps saying that zenrelia is not out yet. I have a relative that has it and the vet prescribed it for them. My dog is on aploquel right now and it’s so expensive. I told them that my relative has some and they said it’s not “officially” out. Is this true? I was thinking about just going to a different vet all together to save the extra 150 bucks.