Don't know of anything off hand, but that truck didn't sell for much more that that brand new in 2005. I had a 2005 3500 Dually, Duramax/Allison, traded in fall of 2009 for an '11. Wanted the 6 speed tranny, the heavier frame, and the Exhaust Brake.
The '05 was nice because it had none of the current pollution ****, but some had cooling issues. It's helpfull to replace the Mouth Piece for the Turbo as the OEM design limits air flow into the Turbo.