大部分的搜尋參數都是一致的，唯獨少數會因為不同地區而有差別導致查詢失敗，請參考 http://docs.aws.amazon.com/AWSECommerceService/latest/DG/localevalues.html
目前先實作US的部份，所以可以看到US Marketplace http://docs.aws.amazon.com/AWSECommerceService/latest/DG/LocaleUS.html
Availability=Available 可僅搜尋有庫存的商品
判斷是否為可賣 Process to Include Item's Availability
1 Include in an ItemSearch request Availability = Available. 2 Include in the request ResponseGroup = Offers. 3 Test to see that the value in the response for TotalOffers is greater than zero.
SearchIndex 混和搜尋： http://docs.aws.amazon.com/AWSECommerceService/latest/DG/CommonItemSearchParameters.html#BlendedSearches
完整的分類 http://docs.aws.amazon.com/AWSECommerceService/latest/DG/LocaleUS.html