We Combine Shipping on all items we sell. Some times when buying Sand that offers shipping included this may not apply. We use Priority Flat rate boxes for shipping sand. This is the Best and most cost efficient way to ship sand. We combine the order we do not allow ebay to calculate combine shipping. We have found that it is never correct. If you want you can e-mail us your request of what you are looking for will give you an exact shipping quoits.