Airbag Control Computer Module

My airbag light flashes and wont stop. i took it to the dealer and they said they need to replace the airbag computer module and its realy expensive. they reset the computer and it stopped flashin for a few days and then came back. so i dont know if it is the computer or something else. anyone know where i can find one at a junkyard near oakland, ca or houston, tx

thanx