Here's the press release from the Yankees:
Tickets for potential 2010 American League Division Series (ALDS) and American League Championship Series (ALCS) games at Yankee Stadium will go on sale to the public online at yankees.com and via Ticketmaster phone at (877) 469-9849 and Ticketmaster TTY at (800) 943-4327 on Wednesday, September 29 at 10 a.m.
Please note that ALDS and ALCS tickets will not be available for purchase at Yankees Clubhouse Shops or through Ticketmaster outlets.
Due to the limited number of tickets available for sale, those purchasing tickets will be limited to two tickets to one game of the ALDS or two tickets to one game of the ALCS, subject to availability. Orders exceeding the assigned ticket limits will be cancelled without contact from Ticketmaster or the New York Yankees.
Tickets purchased via the Internet for Division Series Home Game 1 and Home Game 2 must be purchased utilizing "print at home" technology. There will be no option for Will Call or express shipping.