I guess I am behind the times, but there is a series of books from Lakeside Publishing called The Lakeside Classics. I found out about these from reading Kit Carson's Autobiography edited with an introduction by Milo Milton Quaife. The footnotes have many references to the Lakeside Classics. These are available for a number of different prices starting at about $500 for some of the original rare stuff to the later books which sell for $3. A collection of 25 can be purchased for $450 on ABE. For those interested in western history, these books are worth checking out.