This is a bit of a guess. Other than the one in our collection, I know of one unassembled kit that was sold on Ebay in Dec. 2003, but do not know where it ended up. The Computer History Museum also has a Comter II terminal and keyboard. It looks like the Deramp collection has one also but it might be a CT-256.
For more information, click on the link(s) below. Images of Comter and CT-256