OK, I'll start this board off, I currently live in Katy area of Houston, Texas, and for any other Cheese Makers here, I've found liquid "vegetarian" Malaka Brand Rennet in Whole Foods Store in Sugarland in the cheese department
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I've also looked in Whole Foods Store downtown that didn't have it.
I've also looked in a couple of Kroger and HEB Grocery stores here in Katy and no rennet.