Terryville Chevy in CT has 5 new ZL1s left. 2 manual red rock, 1 manual yellow vert, then a gray and a white automatic. They are great to work with. At this point if you want a new one it's pretty much a given you're going to have to ship wherever you are.
Best search I found - this is specified for new, but you can also change search if you want to check for lightly used:
http://www.autotrader.com/cars-for-s...AM%7CZL1&Log=0