I did some internet searching when I was looking for brake pads and found out that PBR are also sold under the new brand name AXXIS. The one that is best for dust is the Deluxe (organic). I found them at Advance Auto Parts (got them in in 2 days), not sure if in Canada, but should be available under AXXIS Deluxe elsewhere. Advance called them Beck Arnley Axxis Deluxe Organic.
See Links:
http://www.brakeco.com/Axxis%20brakes.htm
http://www.axxisbrakes.com/