From the website (they're running a package deal as well) :
Sector Alpha Package Deal
2 - 30 mm Sector Alpha Sets
1 - 40 mm Sector Alpha Set
4 - 50 mm Sector Alpha Set
(1 each of the 50 mm Bases)
1-120mm Sector Alpha Base
Retail Price on this is $62.50
Package price $56.25
10% savings.