Hi I'm relatively new to Ubercart and I'd like to do the following:

Once a user adds more than 3 of the same product to the cart, discount the product price for all 3 by 13%. What would be the php code to allow the system to calculate this?

Your help much appreciated. Thank you.

I've build a demo here http://hotninedesign.co.za/kznbiz/site/drupal-7.12/