Heads would be a cheaper upgrade that the rockers !!

No "duty" on auto parts due to NAFTA.

Summit or Jegs are probably your best deal for rockers. They'll even ship free if you want to pop over the border to pick them up but I guess a ferry ride, etc. doesn't really make it all that worthwhile !! The nice thing about Summit or Jegs is they have their act together for international shipping ... some vendors couldn`t find Canada on a north american map!