This deal has ended.
Staples is taking 50% off Situations Wood Bookcases through 10/21. Both Oak and White finish are available. The 2-shelf bookcase is now $14.99, the 3-shelf is $19.99 and the 5-shelf is $24.99 (down from $49.99). This is one of the best deals I've seen for bookshelves. Shipping is free if you spend $50. Sales tax is charged.