Everyone loves a bargain but sometimes they’re hard to spot. Sale Flash Pro helps make bargains easy to find by telling the viewer exactly how much of a saving they could make on any given product.
Instead of simply declaring a product is on sale, the Sale Flash Pro extension gives you global and per-product control over sale flash display. Choose whether to display the % discount or the precise amount off the price.
Demo: https://woocommerce.com/products/sale-flash-pro/