Welcome Spencer, There are quite a few GT/CSs for sale here, Ebay, and Craigs list and in various stages of completion. Before you purchase one, make sure you get a Marti Report on the car before you make the deal. This will ensure you don't get a mis-represented clone. A lot of great looking clones out there these days, and not all are passed off as a clone.
If you don't know what a Marti Report is, it is a varification from Kevin Marti at Marti Auto Works proving it is or is not a real California Special. It is based off the VIN of the car. You can get one in a few days for a nominal fee so you can be certain before you buy. Check the RED catagories down the left of your screen, I think the link in under the Resources section.
Good luck, and welcome to the site. Mike