Price comparison with redirect

Hello
Im looking for a module or feature that can be used for price comparison.

Ive used several wordpress plugins, but none really work - so im going back to opencart which i always liked to work with.

Im looking for something like this.

http://i.imgur.com/u4OAoDX.png

I found it on a Magento site, but they dont repsond when i ask about the plugin. Can anyone help ?

Have a nice day!

Niels