Even without Breck, it's still a screaming deal. You can pick them up at Colorado Ski & Golf or REI.
Copper/Winter Park also have four packs. They cost $119 for Copper or $129 for Winter Park. They're not good during Christmas week. New pass purchasers can visit Front Range Christy Sports stores beginning Sept 1
By the way, for most Front Range Skiers, the fourpack is really the way to go. I heard once that most Front Range season pass holders only use their pass an average of 5 times. If that's the case, it's much cheaper to get a fourpack or two.