I saw a used one maybe a week or two ago for around $200USD. The housings weren't in the best of shape but knowing how well built these things are seems like that wouldn't be a problem at all. With the situation with the yen right now I imagine that you might be able to find an amazing deal on a used pair. Great! Shouldn't be a problem navigating the sites then! If I see anything I'll send over a link.
The only problem i currently face, is that my current rig is not high-end enough to be used with the ck100pro. I real pity...with my current setup they are harsh and bright as all hell.