WooCommerce Volume Discount Coupons is an extension for WooCommerce, providing automatic discounts and coupons based on the quantities of products in the cart.
Demo http://codecanyon.net/item/woocommerce-volume-discount-coupons/5539403
Downloadhttps://www.filecad.com/iioG/WooCommerce-Volume-Discount-Coupons-v1.4.0.rar