Tag Plugin: quantity based shipping
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PrangoShip [Quantity Based] for WooCommerce
Lets you assign shipping rates based on the quantity of items in the cart for your WooCommerce Store.
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Advanced WooCommerce Shipping – Flexible Shipping Cost by Weight, Volume & Quantity – Codiepress
Flexible and complex shipping cost solution for WooCommerce. Calculate rates by weight, volume, or quantity with easy-to-define rules.