Aircraft spruce and specialties http://www.aircraftspruce.com
Or if you don't want to order try an avionics shop at your local airport. They may have some that is uncertified for aircraft use and of no use to them.
I have never imported a vehicle but I have heard good things about these guys:
http://www.silkroadautos.com/
Transport Canada importation info:
http://www.tc.gc.ca/eng/roadsafety/safevehicles-importation-other-than-index-446.htm