At Guitar Center
http://www.guitarcenter.c...-109144063-i3103770.gc

"Works with
Mac (32/64)Windows (32/64)VST (for Windows and Mac)Audio units (for Mac only)RTAS (for Windows and Mac)
Note for Pro Tools users:
Ohm Force RTAS formats have been reported as presenting certain issues in Pro Tools 10. Unfortunately, there is currently no plan for fixing them. Therefore, we recommend that you test demo versions before purchasing in order to check their compatibility with your gear."

I'm guessing they weren't moving a whole lot of units at $159. $19 is about where this golden oldie ought to be, but $29 is reasonable if you're into that sort of fingernails-on-a-chalkboard distortion.
 
If you are, you might want to watch for Meldaproduction's MMultibandDistortion to go on sale, which it almost certainly will this month. Just about every product there is going to be half-price sometime in May, which would put MMultibandDistortion at $27.