This week from March 30 to April 5, Wal-Mart Canada will be offering 20% off LEGO City 4433 Dirt Bike Transporter and 4208 Fire Truck for $19.87 each (reg.$24.99).
But quite honestly, its probably better to go to Toys R Us this week as they have more sales going on including 20% off ALL LEGO City. Plus, you can also get 3x more Air Miles when you spend $50.