Registering on http://www.tracychapman.musictoday.com you can purchase tickets before they are actually onsale to general public:
The first concert pre-sale is for the 10/14 O’Shaughnessy Auditorium show on Monday at 10:00 AM Local Time Monday and end Monday at 5:00 PM Local Time. The public on sale is on Tuesday morning on ticketmaster.com.
Check out tracychapman.musictoday.com for upcoming pre-sales for other US gigs
