From this week's SX press release...

Tickets for the event are available at all Ticketmaster outlets, online at www.ticketmaster.com, charge by phone at 800-745-3000 or at the Qualcomm Stadium Box Office located at Gate F. The Qualcomm Stadium box office is open Monday-Friday from 10am – 6pm. For fans looking to purchase adult mid-level seats at a discount, log onto www.ticketmaster.com and enter the code SAND20 and pay just $10 for mid-level adult seats! That’s a savings of $20! Valid now thru Friday, February 5th. Discount valid online only with code.