WooCommece is being used by many webmasters to sell products online. In many cases, it makes sense to offer your loyal customers or certain roles a discount. The WooCommerce Role Pricing extension allows you to do just that. It lets you set discounts by rates or amount. You can offer discounts by products and categories.
The plugin is pretty easy to use. Simply choose how you want to apply discounts and to which price. You can have a different rates for admins, editors, and other roles. This is a free WooCommerce extension.