Sorry if this was posted already, but Redbox is now doing a rent one get one when you purchase a game. Upon checkout, it should pop-up a message saying, "lucky you!" leading to the promotion. Be warned though, prices have been increased recently to 3.xx and limits are put on new Redbox users. New users CANNOT rent two games at the same checkout so the deal renders USELESS to them!
(I live around Orlando FL, unsure if this is YMMV)
Or use the code:
It gives you a free DVD rental or takes $1.50 off a bluray/game rental. Expires 6/30 and can be used up to 5 times if you have used Redbox before. Otherwise it is a limit of 3. Seperate transactions to use it multiple times.
Credit to: Foster1887, Angel98