do you use Red Box DVD rental?
I don't rent a lot of movies, but a co-worker clued me in to Red Box. Those are the DVD rental machines in grocery stores and such. Usually it's $1 a night. Still a bargain when compared to Blockbuster and such, although the movie selection is nowhere near the same (you can check the Red Box web site to see what they consider 'new releases' now, plus they stock some older movies as well).
But: Every Monday they post a free Monday night rental code on their web site, and they've been doing free Wednesday rental codes this month, too.
Of course, if I really want to rent a movie and don't care that it's not a new release only at Blockbuster, I've learned to check the library first! Best deal in town (not that it's truly "free"--because we do pay property taxes!)