This module allows you to modify all kinds of prices e.g. product price, special price, option price and quantity discount on the fly from a single place. You can create different sets of product prices depending on the various criteria including category, manufacture, store, etc. You can decide on what base the price will modify.
Please take note, this module does not alter the product's original price in DB, rather it modifies price on the fly, You can revert your old prices with a single click.