Sears.ca currently has many LEGO sets on sale with savings from $15-$50 off and 15-25% off. Noticeable mentions would be LEGO Technic Motorized Excavator for $199.99 (reg.$249.99) and City Police Station for $104.99 (reg.$129.99). Check their LEGO section for more great deals! All sale prices are good until November 4, 2011.
Also, Sears outlet has 4 LEGO sets reduced by 30-35% off. From October 25-28, you can save an additional 25-30% off in the Outlet section. Use coupon code 941612424 to receive additional 25% off if you do not have a Sears card. If you have a Sears card, use coupon code 941612425 to receive an additional 30% off. This would make final savings of 48-55% off!