In order to pre-order any of the "Out of Stock" products, you can add items of your interest to Enquiry List by pressing "Add to Enquiry List"* button available above. Later you can browse through your complete Enquiry List(available in right column) and email your Enquiry List to us. Please check How to Order Out-of-Stock Items (available in left column) for more information.
*If you do not see "Add to Enquiry List" button on a Out-of-Stock product listing, please log-on using your account details, to activate this feature.