<<Disclaimer: Verify this information before applying it to your situation.>> Here is a list of replies I've received for g/f dry mustard: Frontier Brand found in most health food stores or www.frontiercoop.com Tones brand found in Sam's Club McCormick's found in grocery stores Schillings Brand Durkee's Penzey's which is a large mail order spice catalog. They also have a store in Norwalk, Conn and two or three others out West I believe. www.penzeys.com Thanks everybody. I found Frontier in the health food store near me. Lisa Zafar Orange County, NY