In downtown Copenhagen Vangsgaards Antikvariat has an ongoing Antikvariske Bogudsalg (Antiquarian Book Sale) that is kind of run like a Dutch auction. In short, the maximum price for a single book in the book sale on the first day when all the new stock is put on the shelves (starting at 100 kr. or roughly $14.32 USD) and then this number is gradually decreased incrementally as the days go on, and this is done over the course of month at a time until finally it reaches 5 kr. per book (about $0.72 USD) by the final two days (but by which time the good stuff is largely picked over). I have been frequenting this sale fairly regularly for about a year now and while there is often lot of random stuff that is of no interest to me, I have made some occasional surprising finds including Robert Beekes' A Grammar of Gatha-Avestan, the first volume of the second edition of Johannes Friedrich's Hethitisches Elementarbuch, Rüdiger Schmitt's edited volume of essays on Indogermanische Dichtersprache in the Wege der Forschung series, and more. Basically, the impression that I have gotten (this is just a guess) is that Vangsgaards Antikvariat has so much overstock from buying out other antikvariater in Denmark and it would cost far more to appraise the market value of what they have and store it (until the right buyer comes along) than to just sell it off like this.
Anyway, I went there yesterday for the first time since the new stock was put out and found myself a very bonny first two volumes of Frank Walbank's A Historical Commentary on Polybius in good condition, and in the first printing with the original Oxford University Press red cloth bindings. The third and final volume was not to be found, but I will take my good book-hunting fortune as it comes. Polybius is, of course, one of our most important sources for the period 264 – 146 BCE, covering the early expansion of the Roman empire down to the sack of Corinth and the sack of Carthage (both in 146) which cemented Rome as the dominant state in the Mediterranean, so I am sure that I will probably have some use for these at some point. Total cost to me for these two was 120 kr. or approximately $17.31 USD, a right bargain, considering how much various sellers are trying to get for them on the online international book market.