Hi Jason, congrats on your new Airstream purchase.
I recommend checking the Airstream Store website for some items especially those with logos. Trim pieces can be located online. However if you need something major, there is a RV Salvage yard in Kentucky called Vision RV. They have a nice website and usually have several Airstream motorhomes they are parting out. When I visited their location last year, they had Jeff Gordon's Airstream Skydeck which had been wrecked. Lots of interior parts were available for the drivers compartment and exterior panels.
Enjoy your Airstream this summer