I could not even believe how many food items contain gluten. Foods you would never even think of can and do contain gluten. I think as gluten intolerance/allergy/disease become more and more widely recognized this is changing, but still true.
Because of this, and to save money, I have begun to make Ranch Dressing, Balsamic Vinaigrette, Taco Seasoning, Enchilada Sauce, Pizza Sauce. The great thing is then you know for sure every item you are putting into it. Also, you can make them healthier than the average product for a reasonable price.