Both the Airport Express and Denon AVR-790 (aka the Denon AVR-1910) are still in excellent condition and include all original material like the Audyssey set-up mic, remote, and box, and owner's manual.
I'm also willing to bundle it with the Apple Airport Express ($99 value). This Apple wireless router allows you to stream music wirelessly from your computer, iPhone, or iPad directly to your home theater. You can learn more about it here: http://www.apple.com/airportexpress/
4% fee applies if paying by PayPal, but I'm willing to listen to all offers.