Redbox offers a coupon code good for a 1-night Blu-ray, DVD, or video game rental for free when you text "Valpak" to 727272. (It can be used online or at Redbox locations.) That's the best Redbox coupon we've seen since July. (Most free coupons only apply to DVDs and take just $1.50 off other items.) The coupon code you'll receive expires February 28.