Thanks for starting this thread and thanks to all for the good informations
on zappers.
I just bought two for less than $100

zappper A can be used even worn with ekg/tens adhesive gel electrodes which
this guy also sells. I ordered electrodes too---
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=160419099179&ssPageName=STRK:MEWNX:IT

zapper B is ultra-wearable ----
http://www.ctbusters.com/cart/orgoneproducts-c-22.html

gel electrodes ---
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=350092742971&ssPageName=STRK:MEWNX:IT