Not sure how long this sale has been on (or will stay on), but I noticed that the Pentax Q Adapter for K-Mount Lenses is on sale at Amazon.com for USD$148.55.
Amazon.com : Pentax Q Adapter for K-Mount Lenses : Camera Lens Adapters : Camera & Photo
I've been wanting to get one, but the price in Canada + tax bumps it close to CAD$300, and it's against my religion to get an adapter that costs more than the price of the camera body + lens
Anyway, I just ordered it. It's free shipping within the US, and they also do ship to Canada (with additional shipping and import duty which brings it close to USD$177).