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The two best manufacturers are Stull, and Carriage Works (the latter only use 100% US Sourced materials). While the ebay search is good for looking, almost all of the grilles there are imported from china. Again, just a touchy subject for me (if you see my signature, I think you will understand why).
Go with Carriage Works. It's what I have in my truck and love it. I don't suggest a bolt over though get the replacement. I had the bolt over and it didn't look as good on my truck as Ryan's does.
I second the Carriage Works. I didn't like the thought of the gold honeycomb plastic backing a bolt over. So instead of painting it, I got the replacement. It was exactly the look I wanted for my truck.