parazapper.com is the one, who actively participate in this forum. The zapper with the dial for frequency is not fake probably, but definitely "stole" the name not very fair:)
From cost perspective, I think this is the best choice - http://cgi.ebay.com/Mini-Zapper-Hulda-Clark-Hi-Quality-Low-Price_W0QQitemZ350...
You are totally right about the morale and promotion models in this forum. You can pick several circuits of zappers and make your own alone - http://zappers.narod.ru/