Yeah, well.... the cartridges are third-party. 6 for $20.

Printing in school costs just as much, if not even more... just now
when I printed out a 12-page research paper in school, it cost me
60 cents (5 cents per page).
So extrapolating it over the course of one year... it really makes
sense for me to just print it out myself. Besides, I often need to
print notes out on the spot.