Update on availability: the first shipment to Amazon sold out within a week of the December 15 release. As of today there are four copies of the second shipment left at Amazon, and they have reduced the original $10 discount to $1. However, copies are still available at BarnesandNoble.com, which has reduced its discount from $10 to $2.
This doesn't mean the book has sold out yet, just that it is hard to buy at discount. The University of Pennsylvania Press still has copies. Unfortunately, the Critical Review Foundation is out of extras.