You can give value to your customers by offering them various discounts on products with the help of WooCommerce variable price plugin by FMEAddons. This extension enables you to display special offers on product pages to convert the users into potential customers. You can give your customers a quantity-based discount offer, let suppose if the price of one shirt is $30 and if any customer will buy the shirts in between 2 to 10 then he will get $5 discount on each shirt. And if anyone buys the shirts within the range of 11 to 20 then he will get $8 discount on each shirt. WooCommerce change price plugin is must have tool to increase the traffic and you can get this addon at the cost of only $89.99.