There's a scrap place on the Swords road across from the entrance to Airside retail park (sort of).
Another near Ballymun, behind the Statoil just down from the M50 exit.
if you go through ballymun heading towards the m50, just past the statoil there is a turn to go into the new homebase.(northwood) take this turn but before before you enter northwood take another right and there is a breakers yard there. owner is a guy called Peter Jenkins.