Until Nov. 1st you can save quite some money when buying season 1 to season 4 tables (up to 75%):

Season One - $19.79
Season One Pro - $19.99

Season Two - $9.89
Season Two Pro - $9.99

Season Three - $9.89
Season Three Pro - $9.99

Season Four - $19.79
Season Four Pro - $19.99

Check out the Steam store for your regional equivalent.

Happy Halloween!