Here's a link. Though it looks like they may not be around any more. You can try the toll free number to check.
I paid $339+tax several years ago for the manual version. Since we don't have a garage at the moment it was never installed. Shop around a bit and if interested let me know.
No problem, let me know if you change your mind and want to sell it, I'd be willing to pay more, just let me know what you think a fair price would be.