Cost? $247 from here:
www.durametric.com
You can occasionally find thm on e-bay. Even the enthusiat version is good for three cars (they record VIN numbers from the computer) so a used one will still be good if it's only been used on one or two cars. I bought mine for $100 from a guy selling his Boxster and that one car was all it had been used on - PERFECT!
I'm suprised Wayne doesn't sell them.