I can let you know later this week exactly how much the brokerage/GST is to bring a set into Canada of 175/65TR-15 Pirelli Winter 190 Snowcontrol tires from Tirerack.com
Just ordered them yesterday, 4 tires, no rims. $248US + $75US shipping UPS ground 7-8 days. Exact Shipping cost can be obtained from the Tirerack website when going to checkout.
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Update Dec 12-06: Customs duty and GST at border for above.
Duty (7% of tire value for duty $283.14cdn) $ 19.82
GST (6% of total value inc. duty) $ 18.18
Brok fee. UPS $ 59.45
GST on Brok. fee $ 3.57
Total Brokerage & GST $101.02 cdn$
Additional $4.50 COD + 2.7% of brokerage & gst charge if you don't call into UPS as soon as you know its shipped and give them the shipment tracking number and your visa number to prebill the brokerage and gst. I don't know if customs charges Prov. Sales tax for you non Albertians. Phewww, I need a nap now!

cheers