I evenetually figured out how to successfully make a request to Amazon and Amazon hosted sites.
Heres the snippet of code.
var request = (HttpWebRequest)HttpWebRequest.Create(uri);
request.Method = WebRequestMethods.GET;
request.UserAgent = HttpContextHelper.Current.Request.UserAgent;
request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";