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That's cheaper than it was for me to build mine.Search for regulator withing the fish/aquarium category of pet supplies. Sort highest price first. Anything over $300-$350 for just the regulator is a decent true dual stage rig as a general rule.
Here is an example
Parker Veriflo ir6200 2 Stage CO2 Regulator swagelok planted calcium reactor | eBay
Find many great new & used options and get the best deals for Parker Veriflo ir6200 2 Stage CO2 Regulator swagelok planted calcium reactor at the best online prices at eBay! Free shipping for many products!www.ebay.com
Pretty sure the user selling that one is the C02 regulator guru on the boards (Alan Le sp?)
Hth