So what I bought:
Iain M. Banks / Inversion
Iain M. Banks / Look to Windward
John Barth / The Tidewater Tales
Christopher Brooke / The Twelfth Century Renaissance
R.H.C. Davis / The Normans and their Myth
Philip K. Dick / Flow My Tears, The Policeman Said
Eleanor Shipley Duckett / Carolingian Portraits
Linda Haldeman / The Lastborn of Elvinwood
Tanith Lee / Black Unicorn
Tanith Lee / Days of Grass
Madelaine L'Engle / Walkng on Water
Iris Murdoch / The Nice and the Good
Ignazio Silone / Fontamara
Judith Tarr / Ars Magica
Lynn White, Jr. / Medieval Technology and Social Change
Austin Tappan Wright / Islandia
Douglas Young / Edinburgh in the Age of Sir Walter Scott
Three Greek Romances (Daphnis and Chloe, An Ephesian Tale, The Hunters of Euboea) trans. Moses Hadas
Eighteen books, plus two more bought as gifts; twenty books for twenty dollars. Not bad.