This is a 2-kit set that you can purchase here:
http://www.engineeringshock.com/relaxatron.html
Or here:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=181396030810&ssPageName=STRK:MESE:IT
Check us out at:
http://www.engineeringshock.com/
http://www.paintballprops.com/
http://electroniclessons.com/