Select the "activities" tab, select "other city", type "vail", enter an appropriate date range, then click on search. There is also a deal for Breckenridge and Keystone. Other than the season pass they offer to locals, this is a much better deal than anything else I am aware of.
Here are the details:
Special deal:
Don't miss these great 4- and 6-day ticket deals during Value Weeks at Vail and Beaver Creek!
Dec. 2–15, 2005: Adults ski 4 days for $149 and 6 days for $199. Kids ski 4 days for $129 and 6 days for $169. Season Starter events include Dine Around Vail, a Bode Miller appearance, and an early back bowls preview.
Jan. 2–15, 2006: Adults ski 4 days for $199 and 6 days for $249. Kids ski 4 days for $129 and 6 days for $169. New Year’s Resolution events include a snowboard competition, a 25th anniversary celebration, and live music.
April 3–16, 2006: Adults ski 4 days for $109 and 6 days for $159. Kids ski 4 days for $79 and 6 days for $109. Spring Back events include free concerts, Fiesta Primavera, and the Taste of Vail.
Special deal:
Don't miss these great 4- and 6-day ticket deals during Value Weeks at Breckenridge and Keystone!
Dec. 2–15, 2005: Adults ski 4 days for $139 and 6 days for $179. Events include Hollipalooza, WinterFall, and Luna Chase Snowshoe Race.
Jan. 2–15, 2006: Adults ski 4 days for $189 and 6 days for $229. New Year’s Resolution events include Ullr Fest, Keystone Adventure Tours, and The Rally: X Games training.
April 3–16, 2006: Adults ski 4 days for $99 and 6 days for $139. Spring Massive events include free concerts, Bite of Breckenridge, and an Easter Celebration.