You may return any item(s) UNUSED within 30 days of delivery, for a full refund of the purchase price of the item(s) ( we will also refund the shipping costs to you and back to us of the item(s) , if the return is a result of our error ), unless either of the following two paragraphs apply :

On any item(s) that we shipped for free, the refund is determined as follows :
The cost of the item(s), less a shipping and insurance charge that would have applied to the item(s) , as determined by our shopping cart, using the page without free shipping.

On exchanges of items that were shipped for free, there is a shipping and insurance charge, as determined by our shopping cart, using the page without free shipping, applicable to the item(s) that we send to you in the exchange.