Used PC for media server

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As long as you're not transcoding, you can easily get away with a used SFF machine (I'd recommend as recent generation as you can afford). It's once you start transcoding that you may run into issues. And the issue there is you never know what clients folks are using unless you can get your hands on them (e.g., "Roku" or "Android" is not enough information). Focus on keeping media compatible with clients and you can use that $80 option as a stopgap until you start to experience issues and hopefully you'll be in a better place to get a better rig.

ETA: I would recommend avoiding talk of media acquisition software, even in passing. Media acquisition is a dark grey topic, so we ask that folks avoid it altogether.