Submone

Pull the title, author, description, and image from any Amazon product page using only the product’s ASIN number. Simply place a small shortcode on a page or post with the Amazon ASIN and this plugin will pull in all of the data from Amazon. The plugin will automatically embed your amazon affiliate link in to the image and the title of the product. This makes it very simple to easily promote Amazon products on your blog.
Now with support for Amazon in 6 countries (US, Canada, UK, Germany, France, Japan).

Amazon Scraper

Pull data from any Amazon product page using only the product's ASIN number and automatically embed your amazon affiliate link.

Martyn Davis

So you want to put an ad or an image in your sidebar. And you want it to link to another site. And you want to do it easily, without having to muck about with the code in the text widget.
While there are many WordPress plugins that offer sophisticated image/ad management, there are not many that offer a simple solution.
Simple Image Link lets you easily add images to your sidebar, be they advertisements, buttons of support or buttons of protest without the need for any HTML.
It even displays its name in the widget header within the dashboard allowing you to easily see which simple image link widget is which.

BlogWell's Simple Image Link Widget

A widget which allows you to add an image with a link to your sidebar.

Amazon Scraper vs BlogWell's Simple Image Link Widget