<<Disclaimer: Verify this information before applying it to your situation.>> Hi, I just want to share my experience with a great product I came across accidently several years ago. It's called "Swan" Potato Starch Flour (blue box). I get it in the flour section of Safeway (large chain grocery store in western US) and I also saw it in a large grocery chain in New England this winter (can't remember which store). It makes a great white sauce and also is terrific as a thickener for soups, stews, etc. It's really easy, too. Jane (CA)