Just bought a Kenwood KDC-MP342U from Crutchfield Canada. HIGHLY recommend them - the service was excellent, prices were decent and all harnesses, face plate and instructions included.
I didn't know either ... I was Googling for Crutchfield and Crutchfield Canada came up. I had bought a stereo from Best Buy because someone had given me a gift certificate. Normally my judgement is not so clouded because they are hopeless - after I realized 2 wire harnesses + face plate were needed and 3 stores didn't carry stock, I took it back.