1. You must purchase any 2 Space Pens.2. You must put: I BOUGHT 2 in the COMMENTS Section at the end ofyour check out process.3. We can NOT go back and do it after the fact.4. Although you can do this with multiple orders, there will be amaximum of 1 PR4 Cartridge (or 2 Universal Cartridges if you orderthe TAG/S or Q4) with any individual order.5. This offer is good until Noon December 18, 2012 Pacific time.6. Yes you can share this offer with your friends.7. You will not see any change in your invoice...the shippingdepartment will add your gift if you put I BOUGHT 2 in thecomments section.8. If you have any questions, please CHAT with the operator onSPACEPEN.com OR you can send an email to weborders@SpacePen.com. It may take a full business day for a response-so for immediate help...click on the chat.9. No substitutions.