Our lobby is ever changing. It is important to keep watch for new bargain books, recent arrivals on the Used Books display (changing almost daily,) movie passes at the Concierge Desk, new bus schedules...
And pay attention to the special sales! As I type, we have a sale of 20% Off of O'Reilly computer books, 40% to 60% Off a selection of Oxford Classics paperbacks, 20% Off selected titles from Yale University Press, and a selection of mathematics titles on sale from Princeton University Press!
This is a seriously serious collection of Sales.
And don't forget the Springer Yellow Sale!
Most of these special sales run for, at most, a month, so stop in and hunt before the game is up and your chance is gone.