Safari Extension: Shopping Assistant

The Shopping Assistant will automatically display products from Amazon that match a search that you've done on a number of websites supported by this extension:

Example sites (not necessarily inclusive)

Searching engines: Google, Bing, Yahoo Shopping Major booksellers: Barnes & Noble, Borders Popular shopping websites: eBay, Bestbuy, WalMart, Newegg, Buy.com, Sears Popular deals site: slickdeals, Fatwallet

The extension displays related Amazon products at the bottom of the page. Hovering over the image gives the Ookong price history.

Here it is on Google product search

And on FatWallet