No. The Magic Kingdom Club no longer exists. The Magic Kingdom Club ended in 2000, when Disney replaced it with the now defunct Disney Club. It's a shame because it was a great program for all who were a part of it.
Although once upon a time the Magic Kingdom Club was a great help to many people planning a Disney trip it is no longer available. People were able to book through Dec 2000 to enjoy discounts through this club. Although this is no longer offered Disney offers many more discounts throughout the year for everyone.