The quote was not just for the Driver Door. Tailgate replacement and rear fender sections were quoted also. He found all the panels except the door. He couldn't find a skin either.
Non rusted used right hand doors I can find. Left hand, not so much. Both of the 2001 Rams Quad Cabs I have owned have had a rusted Driver Side Front Door. They rust just above the bottom seam. The top of my drivers' sill is also through the paint and surface rusted where the door seal sets when closed. Both trucks were extended cab.
My Passenger Door and Sill are still holding paint and are just fine. I figured it was caused by the left wheel throwing salt in that door gap, but regardless of what caused the rust, it did not affect the right side. I live near Chicago and all the trucks are rusted, so wrecked trucks around here are not an option. There are guys picking Dodge Truck Parts in non rusting states and bringing them home, but usually they are 2003 and up, not many second generation at all.