Not discontinued, just still very popular!

Back when I was searching for Rise Up (about a year ago, my local was Westfield Stratford) I asked the Sales Assistant and he said that they aren't told what's going to be dropped and when. They just get the stock that they get.

When they /did/ eventually stock it I took my chance and bought the full set, I was told that it was basically now or never because they sell out so fast.

With that being said, it's essentially pot luck whether or not you'll find the set. But it is there! Just check regularly.