Got an interesting issue, I'm not able to eat enough calories to keep gaining weight. I probably need to eat another 500 kcals/day, I'm eating about as much eggs/chicken/bacon/milk/tuna as I can tolerate. So I need some portable, tasty, primal snacks!

High Fat/High Protein-carbs are ok but I don't really need more than I'm getting.
Cheaper the better, because I eat a lot.