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You can’t buy Pakistani army MRE. They are made by company called
Pana Force. Production facility is inside military compound in Nowshera, you can’t even visit without army permission. They will sometimes contract for foreign order, like selling MRE to Afghan army and once to Nigeria as well I think. But these are military orders of thousands of units, not for retail sale. They make MRE and also an emergency pack of dehydrated high density ration.
If you simply want to taste the food, they also sell to civilian under "Lal Qila" brand which you can find in grocery store or hiking equipment store in Pakistan. Food is the same, made in same kitchen, but it is not packed as MRE. It is sold canned for home storage.
Only way to get actual MRE is to find a soldier issued MRE who will donate it to you. This will be hard because MREs not common in Pakistani army, they are used much less than in western militaries. In Pakistan, people prefer fresh food, so even small units have field kitchen called "langar" with designated cook and helper. MREs are only used in extreme situation like in mountains in Kashmir near LOC or in active warzone where field kitchen cannot be set up.