Egg
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Eggs are versatile and highly bioavailable. They're among the cheapest protein almost everywhere around the world
Salmon
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Salmon is among the best fish to eat to remain healthy and also last long and provide high-quality protein.
Tuna
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Tuna is also among the high-protein low-calorie foods, as the calories are contributed by protein and healthy fats and do not cause fat gain
Anchovies
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Anchovies are available in cans and are quite cheap and last long. They're also used to make fish oil supplements.
Cod
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Cod is among the high-protein low-calorie foods that cost less and last long
Cheddar cheese
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Cheese is low-cost and high in protein. Their calories are also contributed by healthy fats and protein and hence do not cause fat gain.
Almond
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For vegans, almonds are among the high-protein low-calorie foods that cost less and last long. They can also be used to prepare almond milk.
Chicken
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The calories and protein in chicken do not cause fat gain and can be considered among the high-protein low-calorie foods that cost less and last long
Yogurt
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Yogurt is among the best probiotic-rich foods that promote digestion
Tofu
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Tofu can definitely be considered the ultimate vegan protein source. It's one of the high-protein low-calorie foods that cost less and last long.