TIW I think has the cheapest rate at $9/hr. There's other places like gallery44, but you'd have to factor in the memberhip fee. See http://www.torontoimageworks.com/rentals_darkrooms.html.
What'd you get?
P.S. There's a bit of a standard process that avoids wasting time/paper, so sometimes it's good to have someone walk you through your first session.