Groupon has a great deal on Blockbuster Express. I'm not sure if this is at every city or not but Knoxville has the deal of $2 for $5 worth of rentals from Blockbuster Express. This deal is good for 5 movie rentals. If you would like to go to Groupon please click here.
Here are some of the details from their deal: Expires May 1, 2013
Limit 1/person, may buy more as gifts. Valid only at any Blockbuster Express kiosks and for online reservation for pickup at kiosks. May use over multiple visits. 1 promo code applies to first night $1 rental. Add'l charges apply beyond initial rental period. Not valid on Blu-ray, Recent Release, or Hot Movie titles.