VIP Tickets are sold out. Individual tickets are $40 and couples tickets are $65. See above website for more info and buying tickets.
From the website:
At this event, he will discuss his body of work, as well as his new novel, The Ocean at the End of the Lane, his first adult novel in eight years. Wondrous and imaginative, and at times deeply scary, The Ocean at the End of the Lane captures the very essence of childhood fear and uncertainty. A clash of memory and reality, it is a pitched fever dream of a novel, and could very well be Gaiman's most accomplished work to date.
Gaiman has announced that this will be his final U.S. tour, so don't miss this rare opportunity to hear him speak!