You can get most of the PRP parts from XD Gun Parts in the US. They will ship up to Canada with no issues. I got 2 of the "Drop in" triggers for both my XDm's and love them. Very simple to do and dropped my trigger pull to just over 3lbs. Also check out the PRP laser cut grips, they are fantastic. Here's a link to their site.
ht tp://www.xdgunparts.com/mm5/merchant.mvc?Session_ID=454ee0b41bb52b88ee8eea7086410050&Screen=PROD&Store_Code=xdgun&Product_Code=PRP-056&Category_Code=Triggers
I was also trying to talk Saskatoon Gun Works into getting some of their products in as well, but haven't checked to see if they have starting carrying them yet.