The prices are from Broadway Camera (two stores in Vancouver and Richmond) : they do the sale until Jan 08, 2010.
To save you time, no need for you to go there, both of them have no more DA*16-50 or 50-135mm. But I saw the DA* 60-250mm at CAD 1600$.
So you go straight to your nearest London Drugs store where you can find these nice lenses, and when you're about to pay, you tell them that you saw a cheaper price at Broadway Camera. Couple of minutes after checking at Broadway's website, they'll be glad to offer you a CAD 300$ discount