Office Depot via Amazon offers the Realspace 2-Shelf Basic Bookcase in Black for $27.99 with free shipping. That's $32 off list price and the lowest total price we could find. It measures approximately 30" x 28" x 12" and has an adjustable shelf.

Meanwhile, Office Depot direct has it for the same price, but shipping isn't free. You can instead opt for in-store pickup.