Find out when your local movie theaters offer discounted tickets all day. Tuesday is a popular one, with many theater chains offering a “$5 Tuesday” promotion all day. All you have to do is show up and buy your tickets.
Some cell phone service providers offer a discount if you buy tickets through their customer portal, with tickets often costing somewhere around $5 rather than the usual $12–$15. You can also check the schedule for early showings. Sometimes the first show of the day is discounted even further than a regular matinee show.