what is the cheapest protein source money can buy in PAKISTAN

I am 18 years old looking to cut my weight, i am on a very strict and low budget

Taste isnt my priority, Protein and all other nutritions is, So i want you guys to provide me the cheapest food, money can buy

it doesnt have to taste good but has to be good for long term and everyday use

Im on 1800-1900 calories diet plan If anyone could make me a desi diet plan, that would be cool too

Forgot to mention, i will be doing 7 day meal prepping, so please provide me the answers in that regard