(q to us-res) Verifying existence of webbshops?

Im wondering if there is a way (and if so, how?) to verify the existence of a particular webshop (to be sure its not a scam).

Do you in USA have some sort online-registry with companyinfo and their webadresses that you can search to check that stuff out?

The particular webshop Im concerned about is:
http://www.theyedoctor.com/

Havent really found much more info than a telephonenr, and a statement that they are located in Wisconsin Rapids, Wisconsin USA (no detailed adress). Scam?