assume that if you are printing lecture slides along with scribe notes, this could run into a liberal number of 1000 pages for the year? (i personally have a quota above 500 but haven't ever really run out). That comes out to about 50 dollars. If you get your own printer, then you already have probably gone above the 50 dollar limit not to mention you have to supply your own printer and ink cartridge. If you further want to match the quality of laser printers, then this cost could go up even more. It doesn't seem like a bad deal but I can't imagine why the school didn't give you a print quota before they start charging you per copy.
Even if you use 2000 pages, 100 dollars isn't all that bad either. If you already have a printer then you can re-assess the financial feasibility but buying one doesn't seem beneficial IMO