Our cart doesn't understand "pre-orders." Our cart only has 2 modes, in stock which means "available for order." Out of stock, not available for order.
In order to accept a back-ordered, but soon to be delivered item, the cart must see the item as "In Stock."
If an item is temporarily out of on-site inventory, but due to be delivered, we leave it in stock.
If in doubt, please email us for confirmation before ordering. It only take s moments for use to look up the delivery status.