(
http://www.kingsoopers.com ). I heard they were about $38.
Another option if you`re here for 5 days is the A-Basin season pass for $169 which includes 5 tickets to Breck or Keystone one of which can be used at Vail or Beaver Creek. A-Basin often stays open until July 4th (
http://www.arapahoebasin.com )