Extension for related/addon product sales

Hello all,

Venturing into the world of Opencart and thought I would see if the good people of this community could help me out.

I am currently working on a site at the moment and came across a function that i really liked and thought would give a better attachment rate for sales.

The functionality was the ability to select addon products and have them added to the main product into the cart at the same time. Here is an example of a site that uses it: http://www.blume2000.de/Blumen/10-Duftr ... -Hara.html

Happy to pay for an extension which can offer this sort of functioning.

Had a look through the modules/extensions on here, as well as ThemeForest with no luck.

Appreciate any help.

Regards
Rob

Something link this: http://www.opencart.com/index.php?route ... on_id=2274