A baking component that often gets pricey-- AP flour is usually cheap and you can get generic/storebrand; I've yet to see storebrand bread flour. I got a box of vital wheat gluten on the clearance pile at Giant-- you can find this stuff at health food stores and big grocery stores, or purchase in smaller bulk quantities online. This is really convenient for recipes that call for only a cup or two of bread flour without necessitating purchasing and storing an extra sack that costs around $5-6 just for 5 pounds! The proportion is all the same-- 1 tsp gluten to 1 cup flour. If making 1/2 cup, use 1/2 tsp.