A Synology is good option here (I say this as someone with 2 UnRaid machines and 1 12-bay Synology). You can even get one that can run Plex for you as well (ass

A Synology is good option here (I say this as someone with 2 UnRaid machines and 1 12-bay Synology). You can even get one that can run Plex for you as well (assuming your transcoding needs are minimal/none, else you might need a seperate box to handle the transcoding and just use the Synology as storage, like I do). 14TB+ hard drives are not too bad (~$235) so that would be 210 movies right there (though you are going to need to "burn" 1 drive for parity). The other option is to more liberally interpret copyright laws and buy the disk then pirate a copy that matches your requirements. Seeing how there are many people out there just doing the pirating step and that you aren't running a pay-for-plex scheme then I can't imagine you running afoul of law enforcement.