If you want the full chrome grille and chrome surround, ala 02\03 vintage package, you're looking at about $2200-2400 if I remember right. (We had to replace one for someone that had the Trident stolen by vandals, but it was a while ago)
Otherwise you can DIY with chrome mesh, or there are a couple of companies around that will chrome plate the current plastic you've got. The old company I used to work with on that has folded, but I've got a couple possibilities. Last I heard they were running 250-350 to chrome a plastic grille. (Almost works like a powdercoat)
The C-Pillar tridents come in two flavors - standard full silver, and the sport gt style with red bars. I think they run in the $20 neighborhood, and my parts department should have some in stock if you want to order some.
- Mark