i have a guy in Newhall, on the way to Magic Mountain that i always go to. he is reasonable and good. i have taken and sent so much business to him, im sure he'd hook you up. especially if you drop the bumper off. his shop is just off the 5 freeway once you get over the hill into Santa Clarita Valley.
the ONLY auto body supply shop i know of is on Sherman Way 1 blk west of Tampa. between Tampa and the church, on the north side of the street. i dont know if youll be able to find a good/reasonable autobody shop by "hanging out" there though. Norm's is behind it and I think they may be owned by the same person(s) but im not sure. Norms is good and FAST but theyre $$. they do mostly dealer-referrred collision work. no deals for cash customers so i wouldnt recommend.