It depends. State schools graduate tuition is pretty cheap $9-12k tuition per year. That said in the US you shouldn't be in academic graduate program unless you have full funding + ta stipend. You SHOULD NOT take out loans to complete and academic graduate degree.
MIT Sloan is about 40k a year for graduate tuition. You'd be a fool not to go if you can get in the program. The doors a degree from MIT Sloan opens are worth every penny. Same goes for Darden, Darthmouth, Kellogg, and Wharton for starters.
Canadian schools may be cheaper but globally US schools put out the most competitive grads.
The only grad school in Canada for business that is worth it's salt is Rotman and that is a second tier school.
London Business School is good when you go international though.
But if you want to pay 30-40k a year to go to a crap school you are a sucker.
I set my goals a long time ago to ensure proper use of my money. Tier 1 Undergrad and doing everything I can to ensure a future at a Top Ranked Grad School. Every dollar of investment in myself I can be sure is a good investment.