Looking for an alternative to the Speedlifter Twist / quickly rotate handlebars solution I'm looking for an alternative to the Speedlifter Twist: http://www.speedlifter.com/twist.php?L=en

The only function I'm interested in is the parking feature where I can turn my handlebar 90˚. I have a small apartment and it would really save a lot of space. I know of the flipphandle (http://www.bikesnapp.com/flipphandle.shtml), but it doesn't appear that the company ever actually put it into production. Has anyone seen anything affordable with similar functionality?
There is the n'lock: Nlock. Which appears to be in production and come in a variety of sizes to fit different bars.  I have no actual experience with them but it looks like it meets the requirements you set out.