For new tires keep you eyes on the flyers from CDN Tire, Costco, ect... the problem is the selection for RWL is very limited so you will end up paying more.
I know Cdn Tire at one time would stock the BFG RWL tires but when I was looking last spring ( and the fall before that ) they were all on Back-Order for months. As I shopped around I found the Goodyear Eagle, Firestone Firehawks, and the Coopers were all on Backorder too. The stuff I did find at the local discount tire shops was either used or old so in my case I waited for the MidNight Madness sale at Performance Improvements and picked up a set of 4 Mickey Thompson Sportsman ST's for a little over $600. Really, if you are plannig a trip to the US for a couple days its cheaper to pull into WalMart or PepBoys and get a set down there and just pay the GST & Duty on them on your return to Canada.