The Canadian Government's surplus site (Crown Assets) has posted a FA* 250-600mm f/5.6 lens for sale. Being in the region, I went to take a look today. The lens is in great condition, a few dings on the finish (normal) but the glass is pristine. Comes with case, filters, cover, etc. It is complete. The rather cute RCMP officer who showed it to me said it was 2 years old (I can;t vouch for this). I tried the lens and the clarity was excellent. Link below. Inside the case was a Pentax Forums printout from the lens database so they could "evaluate the value".
Right next to this drool fest lens is something that is going up in the next few days: an A* 1200mm f/8.
A few caveats:
I believe you have to be a Canadian citizen to be able to buy. Not sure about that. You may want to look further into it, or lean on a Canuck buddy for this one.
There is NO SHIPPING INCLUDED. It's pick-up only, so you have to make your own arrangements.
It's closed bidding so you place your bid and hope it's the highest.
This is legit, folks. I have bought quite a few things from there, including camera gear, musical instruments, jewelry, etc.
What's for Sale - CADC
Follow the link and type "Pentax" in the search field.