You can make a very profitable offer to your visitors or partners if you find products with big discount. Last version of Amazon website interface has not such feature in the left navigation column, but Amazon still can select products by the discount value. Also you can choose parent node in the products categories, minimal discount value, price range and additional keywords. For instance, the following page shows products from the "Electronics : Portable Audio & Video" category with discount 90% and more, price from $10 to $25 and with additional "mp3" keyword:

https://www.amazon.com/s?node=172623&rh=p_8:90-100&low-price=10&high-price=25&keywords=mp3

Yes, you can make this link yourself manually if you know the syntax and the node ids (you can get full node ids list here), but, fortunately, there is a simple website that can do it for you:

Golden Amazon

Just choose category/subcategory, minimal discount value, price range, keywords and click the "Go!" button.