In case you haven't heard, Scholastic Dollar Deals is going on this week. I generally find at least three or four ebooks that I can use... and for $1 a piece, you can't beat it! This is a book of reproducible stories that work with Greek and Latin roots... fun practice for standardized tests. I'm thinking morning work or centers.
There are tons more (850 or so!) so be sure to go on over and check it out!