It is possible to configure volume discounts in an X-Cart store using the add-on Volume Discounts.
You can configure volume discounts either as a fixed amount or a percentage of the order subtotal amount. Unlike coupon discounts, volume discounts do not require your customers to enter any secret code: a volume discount is applied automatically to any order that meets certain conditions defined by a store administrator. Volume discounts can apply to orders with a subtotal amount equal to or greater than a certain amount. They can also apply to orders placed by users of a specific membership level.
When a volume discount is applied, the cart and checkout pages will show the discount amount on a separate line:
For purchases with a subtotal amount below the level needed to get a discount, a message like the following will be displayed: