I came across a Asahi Takumar A 2X converter while checking the used section of Jack's Camera in Muncie Indiana.
I'm not very far from Muncie Indiana and I thought about going and buying it but then I realized I didn't need it.
So here it is if anybody on Pentax Forums would like to buy it.
http://jackscameraused.com/
I don't know what the problem with the original link was, but this shortened one more or less works.
After clicking on the link, on the right-hand side of the list, click on PENTAX MF and that will take you to the page where the 2X converter is listed. Just scroll to the bottom.
I think you would need to call the store but the staff is friendly and helpful. Sadly, they don't have a toll free number.