Right now you can get a FREE $2 credit for Amazon Instant Video on Demand from Amazon Local.
(I had to scroll down to the bottom of the page to see it. You will be asked for your amazon id and password and to complete the transaction, but there is no charge to your credit card.)
The credit is good on any movie and you have until October 31 to rent your pick.
Once you get your credit, go to the Amazon Instant Video Store and pick out your movie. (You usually have 30 days to watch it.)
(Or just use it today if you are having “one of those Mondays”.)