Film really isn't very expensive. Just use it and don't worry about it. Labor and overhead is where the costs are. Doing my own processing, which is one of my main interests anyway (sure as hell isn't art - lol), I can buy and shoot a half dozen rolls of film and print 8x10's of ALL of it (which I wouldn't) for less than it costs to re-ink the the inkjet printer and buy one box of a decent quality photo paper to print upon, not to mention the extra time / aggravation spent in front of the computer.
Delta 100 in 120 off of Amazon is $4.19. Big deal.