From the Vic's Drum Shop Facebook page. I assume it's probably because they aren't selling anymore. If the SK was profitable you better believe they would find a supplier.
BREAKING NEWS:
Ludwig Drums discontinues their Speed King Pedal.
Due to a supplier no longer making critical Speed King parts, Ludwig-Musser Drums and Percussion has decided to discontinue this iconic bass drum pedal. While Ludwig did consider using another supplier, several parts would still have to be made and finished by hand, doubling the cost to manufacture the pedal. While Ludwig will continue to explore manufacturing options, at this time the company cannot say if and when they would be able to offer the pedal again.