I remember getting my Texas instruments financial calculator circa 2009 for probably fifty dollars or so.
The professor told us that at the time, production costs for my fifty dollar calculator were roughly a dollar.
On the bright side, I'll bring that thing in whenever I buy a car and it truly fucks with the whole "what kind of payment are you looking for" routine they do. (Though these days, I'm more likely to bring a laptop with Excel. Same idea, but faster and better visuals)