I like to pass on book sale info whenever possible, and a friend shared a great deal currently being run by Barnes and Noble. If you're shopping online at BN.com and use code R4R9M8F, you'll receive 50% off books for teens. If you prefer shopping in the store, I'm told that there is a printable coupon on the BN website -- but I couldn't find it. If you do, send me the URL and I'll post it here, too.
The deal is available through February 6 and is a one-time deal (you can't use it multiple times) so get your shopping list together fast!