There are a ton of Blockbuster kiosk rental codes out. They are all good for 1 FREE rental.
GORITEAID – Expires midnight 6/30/2011
BBXHERE – Expires midnight 5/8 2011
QUIKTRIP – Expires 06/30/2011
FOODLION (use at a FoodLion kiosk) – Expires 06/30/2011
These codes can be used once per credit/debit card.