It is here (
http://www.subsim.com/store.html); it is a combined SH2 and SH3 DVD set, starforce free and patched to 1.4b with no DVD needed in the drive.
Scroll down to the end of the list.
Also here, but it costs more:
http://www.amazon.com/Silent-Hunter-.../dp/B00023XXN6
Here is where I purchased mine for $9.99+S+H
http://store.navalwarfare.org/