Biology The Unity and Diversity of Life In Good Condition BOOKS ARE NOT RETURNABLE Please wait until all your auctions end before proceeding to checkout to take advantage of any additional item shipping discount. Shipping information We ship most of our items worldwide. We do ship to US P.O. Boxes and APO's. Please have a valid shipping address listed. Normally we ship items out three times a week. During busy times we ship more frequently. Local pick up is not available. We do offer combined shipping on some items. Please wait until all your auctions end or your purchases are made before proceeding to checkout to take advantage of multiple item shipping discount. You have 7 days from the end of the first purchase to add additional items to your order. International Buyers ? Please Note: Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility. Please check with your country's customs office to determine what these additional costs will be prior to bidding or buying. WE HAVE MORE LETHAL DEALS IN OUR STORE!!