Donate from your site

Hi all
What im looking for is a module which will allow me to sell items and a % of the money will go to a charity.

Ebay currently offer this service using a site called mission fish.
So i am currently selling breast cancer ribbon logo's and i offer 100% of the money to the charity on ebay.
The money is directly sent to the charity.

Can anyone shed some light on this as i think this would be a great module and many site owners would incorporate.

Thanks for your time.

Regards
Vikesh