There is a Sia presale going on right now, the password is BUTTONS.
The presale is a little weird because tickets for the November 5th show at the Highline Ballroom are listed on Ticketweb, not Ticketmaster. Tickets for that show are already on public sale (no password needed).
Sia Tour Dates
09/18/07 Bush Hall London, London and South East
10/22/07 Belly Up Tavern – Solana Beach, CA
10/24/07 El Rey Theatre – Los Angeles, CA
10/25/07 Fillmore – San Francisco, CA
10/27/07 Doug Fir Lounge – Portland, OR
10/28/07 Crocodile Cafe – Seattle, WA
10/29/07 The Media Club – Vancouver, BC
11/01/07 Varsity Theater – Minneapolis, MN
11/02/07 Metro – Chicago,IL
11/04/07 World Cafe – Philadelphia, PA
11/05/07 Highline Ballroom – New York, NY
11/07/07 Paradise Rock Club – Boston, MA
11/08/07 9:30 Club – Washington, DC