Westminster Seminary Bookstore has two books on sale that might be worth considering.
The first book is Invitation to Biblical Interpretation: Exploring the Hermeneutical Triad of History, Literature, and Theology by Andreas Köstenberger and Richard Patterson for $23.50 (50% off). This offer is good for only one week.
The second volume of interest is A New Testament Biblical Theology by Greg Beale for $30.24 (45% off). Note that at 45% off this is a better deal than you can get from Baker at ETS or SBL which has this volume at 40% off even before you add sales tax.
If you buy both of these volumes you will qualify for free shipping which comes with any order over $49. By the way, you can help me out by clicking on the links above and helping me earn gift certificates from the bookstore. Thanks.