I think you don't really need the copper pipes--just use a couple moist paper towels folded up til they're stiff. Clip the alligator clip inside the paper where it won't burn you, if you want to get that one zapper you found, then go to the hardware store and by some, probably for less than 50 bucks, eh? I just peeked at home depot's website and they were selling a pipe 10 feet long for like 8 bucks. They'll even cut it for you, I've found.
I think parazapper has some in a lower price range, doesn't he? I'd get my next one from him; he certainly gives good customer service, and really seems to know his stuff. He feels very trust-able to me. Plus if he'd been willing to lie or make crappy ones, the pharmaceutical cartel would have just bribed him---not bothered to sent in the FDA.
I bought a number of them over the years before discovering parazapper, from cheap to expensive, and all but that one with the pennies worked great. The pennies one seem too localized and you had to move it around a lot, and the pennies often gave you electrical burns.