Is there anyone has the 2009 Nav disc Part #20857425? I just bought a used 2007 tahoe and I would love for someone with a Avalanche/Tahoe/Suburban to make me a copy for a small fee. I would be happy to pay $15 to cover the cost of a dual-layer DVD by paypal. Any takers? I am not going to pay $200 bucks for a disc that will be outdated in 2 more years.