Just to expand upon what Gina said.....there is also another site:
Canuck Dogs which has dog shows listed by region....BC/Prairies/Ontario....etc.....you can pick a show closest to where you are to go down and possibly meet a breeder.
There is also a BC Specialty show where I'm sure there will be a lot of breeders from not only BC but surrounding provinces/states as well.....it is posted as occurring on July 27/08 but I'm not sure where yet. For more details whenever they're posted keep checking the Coming Events page on the Rottweiler Club of Canada website.
Heather