If you read the header on the K7DYY web site (NO CLASS E STUFF THERE):
Bringing Class D Technology to Amateur Radio
Change title to Class D & E.
Class E stuff is build build build (i.e. HOMEBREW).
More info here:
http://www.classeradio.com/You think there is a store some place that sells class E amateur radio transmitters
This is cool; K1KBW's 24 FET RF deck for 75 meters: