I buy gluten in the local grocery store, Publix. It is about $2.50 or so. You can order it online from King Arthur Flour. I only use the gluten for wheat or rye breads. I use King Arthur Bread Flour and that has a high rate of gluten in it. I mixed up a Rye sandwich bread in my Oster earlier and it is in the oven baking now. Smells heavenly!