Commerce Bulk Discount

Intended to make it easier to display bulk order discounts or surcharges that display between the Subtotal and Total easier to apply, the Commerce Bulk Discount module provides a way to add custom price components to orders without using PHP. Once a bulk discount price component has been created, it can be implemented by creating a Rule triggered by the 'After updating an existing commerce order' event. Logic can be applied via Rules conditions and the bulk discount amount calculated via a Rules action. The calculated amount can be passed into the provided 'Apply bulk discount to order' Rules action which displays the custom discount or surcharge between the order Subtotal and Total fields.

For a demonstration of how to use this module, see the following screencast:

Commerce Bulk Discount Demo

Note: The current version does not remove discounts automatically if products are removed from the cart so a rule must be manually added to do so. This functionality will be added in the next release.