iTunes discounts a selection of robot-themed movies in digital HD to $4.99 each. (The links are for reference only; you'll need to log into iTunes on an iOS device, choose "Movies" in the dropdown, then arrow through the banners at the top of the page till you find "Robots $4.99 Movies--Limited Time". Click through this banner to see all the eligible titles.) A couple of best bets: Note: Amazon is matching prices for several of these titles.