If you're unfamiliar with the service, it works like this: once you've signed up and paid the fee you'll be sent a special MoviePass card in the mail, which you'll use as a debit card to make ticket purchases going forward. Then you're in the clear to swipe and see practically any movie you want (except 3D/4D or IMAX screenings) without forking over a dime -- at any theater where it's accepted, which is 91% of 'em in the United States at this point. Depending on the theater you plan to visit, you may also be able to purchase a ticket ahead of time, though for the most part it can only be used for same-day tickets.
For commitment-phobes (gamophobes) not ready to pony up $89.95 all at once, there's still the option to pay 9.95 per month for the same service. However, in a press release the company claims this annual price promotion will only be available for a limited time, so you may miss out if you wait too long.