Scholastic Books, publishers of a zillion books, has semi-annual warehouse sales. I haven't been to one of these yet, but I used to go to another book publisher's warehouse sales in Connecticut and they were WONDERFUL! Great bargains. Stacks and stacks of books and book related stuff.
There are scholastic warehouses in every state in America. Go to their web site and find the warehouse nearest you.
If you pre-register online, you will avoid lines and get a $10 coupon. This is a great opportunity to get a jump start on your holiday shopping!