I haven’t purchased a single textbook this year. At a couple of points I was tempted, but going to the library once or twice a semester to read/take notes/photocopy the parts I need from the textbook on reserve is certainly worth the $400 buying the textbooks would cost. Particularly for math classes, the internet is a far better resource than any textbook could be, particularly Mathworld, run by the Mathematica makers. It also helps there are a lot of CS and math resources available freely on the internet, I’d imagine the availability and quality of information would vary substantially between fields.
I did however buy one textbook last year which really bothered me, because they added it to Books24x7 not so long after, which we can access 24 hours a day through the McGill VPN. $110 down the drain.

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