Lyndastuff

I had bought the cookbook, by Sarah Kent, which I really like a lot. Easy to follow with a lot of good recipes/tips, etc.. but my reason for coming here today is that in the book they mention using powdered unflavored egg whites. I find powdered eggs with yolks and vanilla flavored, but not just unflavored powdered egg whites and don't want to get a huge container to start with. Does anyone happen to know where I get them? Thanks in Advance, Lynda