Get some dried fruit/trail mix. Lots of the trail mix is low sodium and high protein, you just need to make sure you find the right packages. If you have a local Aldi store, I suggest you go. Very inexpensive and the quality of their stuff is pretty dang good. They have a large selection of dried fruits and trail mix stuff. Plus all their canned goods are super super cheap. It's bag your own though and they don't provide bags for free. So take your own shopping bags.