For two more exams at university (and only in the actual exams) I really need a calculator that has a direct modulus / mod function. This is for calculating remainders of (very high valued) integer division.

The standard a^b/c you find on Casio calculators for example will not work for anything over 2^128 and I need to handle values at least that size. Unfortunately I cannot just program this functionality into a calculator as any programmable calculators must have their memory clear to be used in the exam. I do not have the $$$ to splurge on a calculator I will only ever use for 6 hours for the rest of my life, nor would I waste the money on it even if I did, considering we are blessed with these things called laptops/tablets/smartphones which all have access to symbolic calculation programs (or frankly we can just run an interactive python shell (or even compile some C on the fly!)).

Does somebody have one of these lying around from university I could borrow or rent for a couple of days before (or at least the day before) my exam on November the 9th? I don't want to spend more than $20 dollars on something I only need for 1 question in an exam, that would be insane. Unfortunately even my lecturer admits that there just isn't enough time in the exam to break the calculation down into smaller chunks, you really need a calculator that has it built-in. Don't ask me why you can't just program it into your calculator when you can also buy an expensive one that has it built-in, especially for math there is nothing you can use to cheat with it... oh well, I will spot myself from ranting before I go any further!

If you don't know if your calculator has the functionality built-in, it probably doesn't (despite the awful documentation that comes with calculators), as the improvised methods don't seem to handle operations with big values (i.e. with lots of digits!)

If you have one of these calculators you definitely know it, as you are/were probably a CS major / Math major doing some Discrete Mathematics like me.

Super random query, but surely this is the place to ask!

I am in Auckland for any possibility to borrow the calculator, and I could come round to pickup and return and leave some cash in-between like a reverse-pawnbroker type of deal.