As of 1-6-09, www.cnc4pc.com is selling it for $149.
For anyone thinking of purchasing mach3, the price will be increasing in January to $175. Only $16, but you may want to buy before the end of the year.
Mach3 2010 Screenset
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)