Oddly enough, once the printer is bought the material can be found for fairly reasonable money. The software I use actually has a parameter where I can enter the characteristics of each type/brand of filament, including the cost per spool.
So now, every time I print something, I also know how much material it spit out and what it cost.
A pipe stand above which I printed cost me around 25 or 30 cents worth of filament and maybe 45min from computer to finished print.
As a hobby, it's not as bad on my wallet as trying to score a bag of Esoterica, that's for sure! Plus it's just rather fun being able to say "How much? Nah, I can just make one of those!"