The Absurdity of Unbelief, "is currently being printed. The Official release date is Jan. 15, though the books should be ready for shipping before then. Take advantage of the 50% off pre-publication special that will continue for the next few days by filling out the contact information on this link below." Here is the link about which he spoke: The Absurdity of Unbelief.
As the link for the pre-publication page says, "Sign up to take advantage of the 50% discount. This does not obligate you in anyway, it simply ensures that you will receive the discounted rate. No payment is due until the time of shipping. You will be contacted a few days prior to the release date with shipping and payment options.." I have read the book, and I highly recommend it as an excellent example of presuppositional apologetics. It is one of those books on apologetics that every pastor should read and have on his shelf for future reference.