(and symposium books in general)
I purchased this book, edited by Rosenthal and Richmond, for thirty pence but the cross-Atlantic postage was at least nine times as much. One of the eleven chapters, the first by Arthurson on the First Cornish Rebellion, was exceptional and many of the others were interesting.
This collaborative book, which was based largely on the 1985 International Congress on Mediaeval Studies at Western Michigan University but also on a symposium at Keele the same year, fits the pattern of several others. Perhaps they should be available as e-books more often, or even e-chapters? It might save both the vendor and purchaser on postage.