For sale is my Rear Converter-A 2x-s because I never really use it. This one is hard to find and has the A contacts on the mount, so you can use all AF and A lenses on this converter. Everything will work (program modes) except from autofocus.
When you set your camera on AF-S, you can use any lens with catch-in focus. I.e. the shutter only fires if the AF sensor confirms that the subject is sharp.
My example is near mint and comes with the original Pentax front and back caps.
Here's a generic picture, I will post actual pictures tonight.
Price: $145 shipped worldwide. Paypal accepted (from confirmed addresses).