Scrivener's A Plain Introduction to the Criticism of the New Testament (2 volumes) is part of the Classic Studies on New Testament Textual Criticism collection (11 volumes). It seems that these two are the only volumes that are not individually available for sale. The other 9 volumes are all available for $9-14 each, but I am not finding a way to purchase the volumes by Scrivener without buying the whole set. They were published in 1894, so there should not be any publisher restrictions governing how they can be sold. Faithlife, please consider making these available for individual purchase. Thanks!