There are still tickets available at www.ticketmaster.ca right now, or you can try again in the afternoon the day before the show. Often at about 4 or 5pm they release a number of tickets for the next day's show.
Unfortunately I found out about the concert only days before and couldn't attend due to prior commitments. From what I heard it was a great concert, not that I expected anything less. Sade sounds great live. Too bad she didn't do my ATF track of hers http://www.youtube.com/watch?v=77cQbKri17A