Here are a bunch of codes for Blockbuster Express rentals. These are for $1 off a movie so I think they work on the $2.99 ones or the $1.00 ones.
I like to reserve the movie online first just to be certain it works. You can choose your kiosk location and enter the code and it should say $0. If you do that and then don’t pick up the movie, you will be charged $1.
You just text any of the following words to 39777:
These should be valid for 10 days after you send the text. I tested it and my code came within just a minute.
You can find a Blockbuster Express kiosk near you here.