This WordPress plugin adds a tiered flat rate shipping option for the WooCommerce plugin.
WordPress administrative users can create a tiered flat rate shipping fee based on the total number of items in a WooCommerce cart. There are two tiers in this shipping method:
Base shipping fee: This is the base (default) flat shipping fee that is applied automatically to the cart total for any number of items.
Additional shipping fee for tiers: This is the additional shipping fee that is added to the base fee if the number of items in the user's cart exceeds a specified number. This tiered fee can either be a flat fee, meaning that it is applied to carts of any size above the specified tier quantity, or a progressive fee, meaning that the tier quantity is used as a multiplier to the tiered fee.