The FDA and FTC are constantly attacking and shutting down any sites that sell zappers. As pawns of the pharmaceutical industry, they will do almost anything to shut down the use of electrical devices for health purposes.
I actually have one of those Gorilla units and like it.
Anyone who believes that the public should have access to these types of units should sign the petition at http://paradevices.com
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Scroll down the page and click the link where it says "FDA Petition for zappers".
While you are at paradevices.com, be sure to read at least a few of the pages there as well as the comments left by those who previously signed the petition.