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The Supra IV that was made by Second Nature is no longer produced.. at least by them. I think that the factory that made them for Second Nature has a similar pump on the market.
I have the smalest one they make. It was about $175 awhile ago. I love it. I am easily running 50 tanks (mostly small - 10/15g) and I have way more air than I need. Don't know about the Supra IV though.
Neil