While we attempt to keep sufficient inventory to fill orders with a 4-day period (business days), there are times when we are out of stock on certain items. If items are out of stock and is set up to allow you to add to the cart as a backorder, your shipment will be sent immediately and the backordered items will be sent as soon as they arrive at no additional charge to the customer. however, we reserve the right to hold the order for 3 business days if we know the backordered items will be in stock. This policy applies to the 48 continental United States only, and shipments to Alaska, Hawaii, and overseas will be held until all items can be shipped directly. Items that are not able to be backordered but that are special orders will incur a separate shipping charge if you want them shipped separately from the remainder of your order. Backordered items will be sent by the least cost effective method, even if your original shipping method was Express (2-day, 3-day, or Express Mail)