Text the folks at Redbox, get a coupon and then get yourself a cheap Blu-ray rental.
Redbox already offers cheap DVD rentals, and their Blu-ray and videogame rental prices aren't too shabby either. Their May celebration called "10 Days of Deals" makes things even cheaper.
Simply text the word "May" to the number 727272 and you'll get yourself a random discount that will be good for twenty five cents off a rental, fifty cents off a rental or a dollar off. You've got until May 22nd to keep texting, so if you're only getting a quarter off, you can always hit it up again the next day.
And a heads up – this code will be good at kiosks only.