What's a good price to you? There are a few of them on eBay for $.99 but there is a reserve on them. I'm guessing probably about $500 based on the other exhausts the seller has listed. He (Frank Kent Outlet Parts) seems to have a lot of them so maybe you can email him and shoot him an offer. They sell new ones on GM Parts Direct for ~$780 plus $180 shipping so the $600 is a lot cheaper than that but it isn't a great deal. I'll keep an eye out for you and let you know if I see anything out there.

- Jason