have site and there is affiliate link of amazonMaybe adwords will not approve your campaign because you violate adwords policies
One thing you can do is start going on Keyword Planner and pick items related to your niche, Scroll down find 500-1k views p/m Keywords and use the moz toolbar to check for competition.what i can do bro. i need low prices keywords :/ help me please.. at this momnet i dont have any sitesonly i want keywords low prices. i want calls and have some landig page