Sorry Fscott but where are you finding these incredible deals? Last time I looked(today) on whiskyauction they seemed ridiculously priced(though the Hanyu's are usually better value than the Karuizawa's). Is there somewhere else you have found them cheaper?
Is it the fancy label you are 'seduced' by or the whisky inside?
I'm more of fan of Hanyu than Karuizawa(personal taste), but the Noh Hanyu I've had doesn't work that well for me. Reason, fully sherry matured or sherry finished Hanyu's/Ichiro's Malts(same thing) are the least successful style that distillery has produced IMO. Unless that is you like gunpowder/matchheads/sulphur. Some have less of this than others the Noh being at the upper end of the scale. It not a bad whisky the Noh, just not great.
As for Karuizawa, reasonable well priced for what they are when first introduced to UK/Europe, I personally find no value in them now(well the one's sold there). I have some really good ones and some really crap ones. It's down the list of my favorite Japanese distilleries, so no need for me bothering to paying the money being asked these days in UK/Europe. I've had/have a number of other Japanese whiskys I'd rate in the 90's that cost 100 bucks or less.
Best someone who loves Karuizawa's answer about their Noh bottlings as you may have similar tastes and are prepared to pay the money being asked for them.
Oh I guess I answered your second question. You will find them on whiskyauction.http://www.whiskyauction.com/