Half Price Books has a great sale this weekend (8/29-9/2) with 20% off store wide. This could make for some really great savings on your favorite books.
There's a chance to also take an additional 10% off with a coupon that will be emailed to first time subscribers for joining their mailing list. If you haven't put your name on that list you're missing out! They send out great coupons regularly. I received my first coupon in my inbox in less than an hour and it's good for 1 month.
Recently, mailing list subscribers enjoyed an entire month of deep discounts with coupons received in the mail. No printing necessary! But no worries if 1 coupon isn't enough, they also email those same coupons to your inbox to print. Just be sure to read the details on each coupon to make sure you can enjoy multiple savings.