The Westminster Bookstore has two volumes in the clearance section which might be of some interest.
Baptism: Three Views (Paperback) by David F.Wright, Bruce A, Ware, Sinclair B. Ferguson, and Anthony N. S. Lane. The bookstore has the $16.00 book at 69% off or $4.97. Go here.
The Book of Hosea, New International Commentary on the Old Testament by Andrew J. Dearman.. The bookstore has the $45.00 book at 50% off or $22.50. Go here.