Desiring God announced a couple days ago that several of the books published this fall by John Piper are now available for free online as .pdf files. If you are looking for an inexpensive way to read good books, this is it. I have either read or am currently reading all these books, or listened to the sermon series on which they are based. I highly recommend each of them:
Apart from the book Stand, all these books are also available for a very reasonable price (no more than $5) on our book cart.
Words of Grace 