When I moved to fifth grade this past year, I decided I wanted to move away from the reading series a little bit and do more novel studies. This worked out wonderfully in my classroom, but I did have a problem in the beginning: how could I get my hands on 25 class copies of the same book? I had a cabinet full of books, but I wanted to use novels that I had already planned out. After a friend mentioned using Scholastic book orders to gain class sets of novels, I thought this was a brilliant idea! Scholastic always features a book in every order that is listed for $1. I kept an eye out for good quality novels that were $1 but never saw any. 
One day during plan I stumbled onto a page on the Scholastic Reading Club (formerly Scholastic Book Club) site that showed all of the $1 books. I looked around for a bit, but then my kids returned from PE and I clicked off the page. I ended up having to call Scholastic to see how to get to the page again and that's when the representative taught me a little trick:

If you search for "$1" it will bring up all the books that are currently listed for $1! I was able to buy my class set of Tuck Everlasting this way and I also snagged a class set of The Westing Game. There aren't nearly as many upper grade books right now as there are lower elementary, so kindergarten and 1st grade friends: be sure to check it out! :)