The site looks fairly legit. It has only one review, but it is positive.
http://local.yahoo.com/info-15053822-nylon-net-company-memphisOne method to try is to hold down f5 for 30 minutes. It'll keep refreshing the page over and over again. If the page is still responding quickly after that time then it's probably legit. If it get's ridiculously sluggish then it might not be. Basically, if the page still is fast it means it is hosted on a good server, whereas a cheaper fake site would be hosted on a slapdash cheap server that couldn't withstand that*. Also try searching up that company's address on Google Maps, if a building titled Nylon Net is there than it's probably legit, and if no such building exists then chances are it's not.
Either way, good luck with your purchase
*jk, I wouldn't actually recommend this