I love the idea of these subscriptions, available from Ladies & Gentlemen. For $100 ($90 for the children's books subscription), you'll receive 6 vintage books over as many months, in the category of your choice. Chose from either the "Graphical Assiatance Program" (graphics), "No Inner-Child Left Behind" (children's books), "Residential Beautification Act" (home decor and improvement), and "Operation Crafty Freedom" (crafts & how to). Ladies & Gentlemen promises to only provide books that are in excellent to good condition, with a mix of both hard and soft covers as well as color and black & white images, and with all books having been published before 1985.
For more information about Ladies & Gentlemen, check out their blog, here.