I have not seen any major site using a 3[SUP]rd[/SUP] party readymade script, so if you are planning on a long term and sustainable business on your website, a custom development solution and approach is recommended. Most of the clone services that you find online are readymade scripts, almost all of which are non-functioning in one way or the other. I could only find NCrypted which is providing custom development solution for popular website clones. You can contact them for Amazon clone and check out what they have to offer for your requirement.