It depends... If you want to promote by PPC expecially with Google Adwords, Yes of course you have to make your own landing page, because PPC like adwords so many people use amazon.com as display and destination url, so mnay competitor for Amazon.com, that's why you have to make own destination url if you don't want to fight bidding with them. But if you run PPC - with Y!SM, so many keyword and ads, no need to make your own landing page. If you prefer Amazon.com as your landing page So your question, There are so many answer to. USe or not use your own landing page Use or not use Domain Register Use or not use Google Adwords. So many ways to go....Good luck