The New York Times is reporting that CSX2129, the third of three original 289 Sebring roadsters, will be offered by Gooding & Company at Pebble Beach, Aug 20-21, 2011.
I couldn't find anything about this car on the Gooding website yet, but here's a link to the NY Times article if you're interested...
For an Owner of a Shelby Cobra, a Bittersweet Return on Investment - NYTimes.com