Feta is sold both in blocks and pre-crumbled — blocks are almost always cheaper per ounce, and crumbling it yourself takes seconds. Sun-dried tomatoes packed in oil can be pricey, so look for the dry-packed bagged version instead, which costs less and works just as well once rehydrated slightly by the egg mixture during baking. A dozen eggs remains one of the best protein-per-dollar purchases in any grocery store.