Update 2: In addition to their extra 10-15% off coupon, they also have a all week long FREE $10 Gift Card Coupon when you spend $40. (thanks striderhiryu)
Update: I read the flier wrong as its actually only BOGO 50% off LEGO City, Ninjago and Star Wars, not all LEGO themes. (thanks striderhiryu)
In addition to their Saturday only 63% off LEGO Specials, Zellers Canada will be offering a Buy 1 Get 1 50% off ALL LEGO Sale this week from December 16-22. Maximize your savings up to 25% off by purchasing sets of equal value. Also, it appears that the LEGO Star Wars Advent Calendar is now on clearance for $24.99 (reg.$49.99) which works out to be half price.
Plus, forum member striderhiryu informs us there is also a coupon for an extra 10-15% off on Saturday (Friday if Quebec). This makes the savings even better (especially the two 63% off LEGO sets) so visit our Sales & Deals Forum to take advantage of it!