I live in the united states ,,still have to find a 12 volt transformer , but should not be more than $90.00 bucks (us. currency) this price will include labor and shipping ,where are you located ? also you have a choice between 9-10 volts dc output or 12-14 volts dc output from the zapper ,I prefer the higher voltage ,I will kill more parasites ? let me know before I build it .