Some of these books had ebooks and both hardcover and softcover editions as part of the publishing program. (vjbscribe.com)
Currently over 70,000 titles currently participating in Matchbook and is applicable to hard and softcover editions sold online. (goodereader.com)
John Clarkson: There are suppliers out there that seem to have a cache of my old softcover editions and sell them for a penny and postage. (bidinotto.com)