Simple Order Discount
for osCommerce Online Merchant v2.3
This module helps to give discount to the user on the number of products he is purchasing in the order. Minimum number of product to be purchase to avail this discount and the Discount Amount can be modified in the control panel.
This module also can be modified to use on the total amount of order value instead of number of product in the order. For this you really need to know the php coding and oscommerce basic programming style.