Check the nutritional information on the packages with sausage (very yummy but not so nutritional). You may be surprised how little protein you get. Some is mostly fat. You get a lot more protein for the wieght from jerkey.

Almonds added to rice dishes
Add a spoonful of powdered milk to meals
TVP - a spoonful per meal
Protein powder
Any kind of nut added to cooked cereal
Soy nuts
Cheese - use a hard cheese like parmasan- it keeps better
FD egg whites