I thought _On Lisp_ was available as a free pdf, which should have caused the price to drop. (I think he joked about the people who were planning to retire on the proceeds at the time).

I just checked Amazon, and it turns out the lowest price one is $ 52.00, and the one I thought was a reprint turned out to be upon closer examination a translation into Japanese. (Which is about thirty dollars or so, from 2007).

I already had the PDF, but wanted a nice small book with the same form factor as ANSI Common Lisp. I guess I was making a lot of money at the time, and this is before I had completely come around to e-books.