Well, if they send me two (one for the CD/DVD combo and another for the Blu-Ray) I'll be happy to share one since I won't need two.
Edit:FYI for everyone, it is only one code per customer so they will be unique and no matter how much you order, you only get one.
The trick is to get someone else to order one as well for you so you get another code.
While supplies last, eligible fans who pre-order or purchase Celtic Woman's Home For Christmas on or before October 28th, 2013 on Amazon.com will receive a unique presale code good for early access to purchase up to two tickets for their upcoming North American tour. Early access using the presale codes is available between October 28th, 2013 at 10 AM local time and November 8, 2013 at 10 PM local time. Please note concert tickets and presale codes are subject to availability and the presale code does not guarantee tickets to the concert or price level of your choice. Your preorder code will be emailed within 48 hours of your CD shipping. Limit 1 code per Amazon customer.