You can’t beat free. Especially 400-500 free movies on iPads, iPhones, Roku and soon on smart TVs like Samsungs and all the Android devices! And maybe 700 flicks by year-end! Popcorn sales are definitely going up. Popcornflix, the free, ad-supported online streaming movie service will soon appear on more OTT devices. Gary Delfiner, EVP of digital distribution at its owner Screen Media Ventures, told us that the company is getting ready to launch an Android app at the end of July and a Samsung smart TV app sometime thereafter. ‘That will bring us to two hundred million devices,’ Delfiner said. The Popcornflix app is currently available on Roku and Apple’s iOS smart devices (iPads, iPhones, iPod Touches, but not Apple…