I got lucky on mine I walked in PnP & there was a freshly restored 84 Prospector hit hard in the passenger bed side
The owner had installed all NOS trim as well as a bunch of other stuff
I had a blast & there was nothing left but the bed cab & frame when I left

I've been buying NOS trim for my RC & my 85 LWB truck for the last 6 years or so & have only seen one grille shell NOS & the guy wanted $750 for it
He has NOS core support,fenders,hood & for $700-1000 each
All on Ebay

There's member here who sells on there that has some truck stuff every now & then NOS
He's proud of it sometimes & sometimes he's on the $$$ as far as price