Last year I "scored" a couple of excellent buys. You'll be sorry if you pass it up: most of ChristianAudio's digital download books are on sale for $7.49.
Last year, I got Waltke's Biblical Theology. Normally $45.98, on sale for $7.49. Totally worth it. (It comes with Gordon Fee's NT Biblical Theology, which I found annoying and worthless, and on which I bailed out. But it's still worth it for Waltke.)
Don't miss it.