If you have never used redbox before there are a few promo codes to maximize and get the 3 movies free! Hy-Vee - 42HY4V8E. This code is good until 04/18/10 for one free rental.
DVDATWAG (valid only at Walgreens).
DVDKROG (valid and Kroger and all affliate stores)
Go here for redbox locations.