Market Watch: Advise and Consent by Allen Drury

The 1960 Pulitzer fiction award winner Advise and Consent by Allen Drury seems to be dwindling in supply and rising in price at the moment. It's still not what I would call scarce, and there are still a few copies floating around for under ten bucks, but it's definitely shifted compared to the last time I bothered to check, with significantly fewer copies and rather higher prices, even for books in only fair condition. Hmmm. I wonder if this is a fluke or a trend?