Today only (expires at 11:59 pm) use promo code: THURSDAY to get a one-night dvd rental from Redbox for .50 cents.  (Blu-ray Discs and video games will receive a .50 cent discount since they are more expensive than standard movie rentals).

A good source for future deals and promo's is this site, InsideRedBox.  They provide a page of potential codes as well here.  For your nearest Redbox location, head here.