I use Canon because I find they don't break down much and the cartridges are somewhat cheaper as compared to HP. Usually.
I recommend Island Inkjet for cartridge refills
. I think they cut it down to at least 60% of the original price, and basically they refill (almost?) any brand of cartridge. There is one in Westdale near King/Sterling, so it's pretty close to school.
I second/third (or whatever) all those people who say you should get a personal printer rather than using a public one. You will definitely have assignments that you might finish later than you thought you would, and waiting in line or having to get to school early, etc. will only stress you out even more...