[ndrarmst]

From what I've seen, the Canadian stipends range from a low of about $15k, for those on research assistantships (paid out of their supervisor's research budget) or on provincial scholarships, to a high of about $21k (NSERC or other tri-council federal scholarships). There are a limited number of higher-paying tri-council scholarships as well.

Some universities will top up a federal/provincial scholarship (Waterloo tops up by $10,000), and teaching assistantships are available as well. However, part-time work hours (TA or otherwise) are usually limited by the terms of the scholarship/assitantship, so there is a limit to how much a student can reasonably earn while doing a degree (NSERC limits to 10 hours worked/week, the expected hours for a TA).

Tuition is paid out of the student's stipend amount, though it's often quite a bit less than undergraduate tuition in CS and similar programs. My fee bill dropped in half when I finished my BASc and started an MASc.