Here is a cheap and easy way to get protein and have it handy "on the go."
Mini Quiche Cups! (all you guys are going "Ewww quiche, it's so girly!" Stop being so macho. This will help you).

Buy 1-2 dozen eggs. On a free afternoon, heat your oven to 350*F. Chop up a bunch of vegetables: mushrooms, peppers, onions. Saute these all in butter or olive oil; season with herbs and a little salt. You can also just use frozen chopped spinach, if you thaw it and drain it really really well (squeeze it between paper towels several times, it holds a lot of water).
Crack all of your eggs into a bowl and whisk until thoroughly beaten. Whisk in your vegetables and some shredded cheese.
Pour this mixture into lightly-greased muffin cups and bake at 350 for 20 minutes or until set.
You can keep these quiche cups handy for an easy grab-and-go breakfast or snack. They can also be frozen and thawed/reheated in the microwave, so if you make a whole bunch at a time you can stock up. A dozen eggs will make about 48 quiches. Not too shabby!