Stampin Up! has just released the list of supplies that will be retiring. It's 12 pages long! Really, 12 pages! I am astonished! I have been told that some of the items, such as ink pads and stamp scrubber, are being revamped. So, they are not really doing away with them but the current design is retiring.
Unlike the stamp sets that are retiring, the supply items are "as supplies last". So, once they are gone, they are gone.