Redbox offers a free1-night movie rental via coupon code "SWEET". (This code works at the kiosk or online.) Even better, starting February 14, "HEART" will net an additional free rental. (This code works at a kiosk or online.) Combined, that's the best offer we've seen from Redbox in a year. (We saw a single rental for free with $5 spent at Coinstar last month.) Search for a Redbox kiosk location near you. Both codes expire February 14.
Update: Coupon code "HIGHFIVE" also yields a free1-night movie rental. (This code works at the kiosk or online.)
Update 2: Although the codes are valid on Blu-ray rentals, they only discount your purchase by $1.20.