The amplifier went out on my 2008 enclave (we just got it 2 weeks ago). Saturday it started blaring white noise at full volume when the car wasn't even on and nothing would make it stop. It happened a few times so my husband removed the amplifier, so now I have no noise at all (radio, DVD, blinkers). Where can I get a new amp? I've found them in the $200-300 range but I'm just not sure if that's a good price.