A number of stores in the Sendai area will be holding special sales in celebration of the Eagles Climax Series berth. Included in the list of stores holding sales? Mitsukoshi, Sakurano, and Miyagi Seikyo (COOP) just to name a few. You can get the full list (in Japanese) at the official Eagles' website.
Below are some screen shots of websites detailing the sales they will be holding.
=== Updated 10/5/2009 @ 8:23am JST
About 700 fans lined up for the sales at Mitsukoshi on Sunday. That's more than double the number of Giants' fans (about 300) that showed up for the celebratory sales at the Mitsukoshi in Tokyo back when they clinched the Central League title.
=== Updated 10/5/2009 @ 1:05pm JST
Sale periods for various stores, in and around the Miyagi area, have been posted:
Mitsukoshi - 3 day sale starting on the 10/4
Sendai Parco - sales begin on 10/16
K's Denki - sale from the 10/11 to 10/17
Tohoku Lawson's - sale from 10/9 to 10/18
Miyagi Seikyo - sale from 10/15 to 10/18