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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
https://www.ebay.com/itm/274379265141
Pretty sure the user selling that one is the C02 regulator guru on the boards (Alan Le sp?)
Hth