According to TicketMaster the presale for the October 27th Portland Oregon show begins Tuesday 09/13/05 10:00 AM.
http://www.ticketmaster.com/artist/734667
Presale Info:
Start : Tuesday, September 13, 2005 – 10:00 AM PDT
End : Friday, September 16, 2005 – 12:00 PM PDT
Password : BUFFETT