There are a few out there, but a lot of the sellers want unsupportable prices for them--prices you could buy clean title for. Typical of a lot of private parties that don't have a clue what a branded title does. My DD is rebuilt, and it came at a discount of about 40% to 50%. That's the high end of the spectrum, but it needed tires and still had a small dent. Most of the branded Vettes are running higher than that discount, but I wouldn't go much less. There is some guy in Minnesota with a rebuilt 2005 convertible with 55k on the clock that wants $25k for it. I can't imagine you are interested, but let me know if you are.
There is a decently priced one at a dealer in Michigan. They have it listed as a manual, but it isn't:
You could also look at some higher mileage cars. There are plenty of coupes out there quite cheap.
If I stumble across anything else, I'll post it up for you.
EDIT: Also a rebuilt convertible in Miami: http://miami.craigslist.org/brw/ctd/3971346222.html
Not much in the way of photos or info.
If you can find your way to loving yellow, there's this: http://www.cars.com/go/search/detail...nal&listType=1