I love the idea of portable "grab and go" foods. You can make-ahead breakfast sandwiches with bagel thins, light English muffins or Arnold bread rounds, egg/egg whites, veggies, sausage/turkey, and/or cheese.
Another good idea is make-ahead crustless mini-quiches with any number of meats, veggies, etc.
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Just zap in the microwave and go.
If you can sit down, there are egg-mug recipes that cook eggs in a few minutes.
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Also, having been pretty frugal and trying to eat right years ago, I started shopping at alternative stores. If Aldi, PriceRite, ShopRite, or small Asian markets are an option, they tend to have cheaper produce and sometimes have items (turkey bacon, turkey sausage patties, eggs, light cheeses) that can be more expensive at traditional grocery stores.
There is always my backup, soup for breakfast. Cheap, satisfying, and delicious!