If you find a nice one I can restore it for you, this includes properly repairing breaks in the plastic and OE correct paint details etc. Prices will vary as each is quoted based on estimated labor hours involved, so, the cleaner the grille, the less it will cost you to restore. I'll warn you up front though, most grille restorations pass the $500.00 mark, most A-body grilles take a ton of time to properly prep and mask for paint, they are allot of work to get OE correct.
The $1,000.00 NOS grille mentioned above sounds like a good deal if it's mint, the reason is that if you invest several hundred in a nice used grille, then pay for a highly detailed OE type restoration (which can easily exceed what you paid for the grille) you could easily end up spending more than $1,000.00.