I've been waiting to add both cascade and centennial to my garden. They finally went on sale at midnight. They have limited quantities, so you better act fast! I just ordered cascade centennial and magnum!
Here is their facebook post:
We are exactly one like away from 1600! This calls for a celebration! Without further delay, tonight starting at Midnight we will be releasing Cascade and Centennial for a 72 hour sale. This sale will last until Monday night at midnight, and we do not expect these varieties to be available again until summer or possibly even fall. If you have been waiting patiently for these two varieties, now is your only time to order! Due to the extremely limited quantity we have available of both Cascade and Centennial, we are asking that you order a maximum of 4 plants per variety.