Hi again llbonner,
It so happens that the Chinese Government is not really particular about selling counterfeit products, thus we have a lot of Chinese sites selling copies of brand name products such as Nike.
Yet again the site you mentioned in your post is another one to stay away from. It's hardly ideal to buy from suppliers that fail to mention their physical address, contact email (although they have a contact us page) and a really phone number.
By the way they are located in Fujian, China and have been online for less than a year, based on the whois search i did. You may visit this link for your reference:
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As mentioned previously, most if not all authentic Nike products are available only through Nike and their authorized dealers. If you are lucky you may find a few pairs through liquidations and closeouts.
Cheers!