Head on over to this page on Groupon to pay $2 for Five Movie Rentals from Blockbuster Express ($5 Value). Not valid on Blu-ray or Hot List titles. Doesn’t expire for 2 years, so you’ll have plenty of time to use the codes!
I use Netflix, so I don’t know if this is a great deal or not, because I never rent from those kiosks. What do you think?