I couldn't live without a printer. It's one of the top priorities for me.
In our first year PhD program we had to read about 10-15 articles a week, plus more for research.
I hate reading electronic PDFs. I like to make manual notes and highlight. So I print a lot.
I have purchased two HP B&W laser printers on eBay for around $30 each. I have one at home, and one in my office at school. Even though we are on a networked department printer/scanner - I am so glad I have my own printer in my office.
Often the printer at school is down (it's a Kyocera that is always having trouble) and it's slow with printing PDFs. The faculty grumble when a student is delaying their copying because we are printing off our papers. So during prime time - I print in my office.
Amazon has refurbished toner cartridges for less than $15. It's worth the cost.