You actually get it right from the Vet's office - at least up here. I went in and explained what I wanted it for and talked to them a bit about my tanks and they were more than happy to order it for me. I could have gotten 10 boxes is I wanted but only ordered 2. If you have trouble let me know and I will get you one up here or send you a couple of the pills from my stash.
It might not hurt to print out the write up from reef.org if you are going in so they can see your not fluffing them.
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