if you ave a circuit city in your ares they have TONS of that crap all out 50% or more off since they are going out of business.
at ours you can tell they just took everything from the install shop and tossed it in boxes. you can just dig through it and they make up a price. i bought 8 2awg amp install kits for only 10 bucks each.
they also have all the dash kits and various things needed for installs that normaly would not be for sale. even all the tools. i had a field day. ended up spending around 600 bucks but i would have spent a few thousand at retail