I found my copy, the seventh printing of the first edition, in Evanston, IL, twenty years ago. The one I found recently in Portland, is the eighth printing, and in fine condition.
Price-wise, this copy was a ridiculous steal at $17. Abebooks has similar copies for $250, and even a signed copy of the Routledge edition.
So I'm keeping it. The newer edition has the most beautiful textured cover. Here they are together for comparison, with the copy from Portland on top of my trusty old one.
I'm fresh out of vinyl jackets -- exhausted from Value Village raids -- ordered some tonight from Demco. It doesn't take me long to burn through 100 of these sleeves.
My mother gave me some Hayek last Christmas. This book lacks a dust-jacket, but it is very clean and tight for a fifty year-old book.
At Powell's, I also found a few more kids books from Grosset & Dunlap's Illustrated Junior Library, and a hardcover edition gathering together Fritz Leiber's Lankhmar books with Fafhrd and the Gray Mouser. These are books my kids need to read!