I got my kids unused but out of date premium phones. You can get a unused LG G3 on ebay for about $140 with free shipping. If you skip activating it you can used WiFi for almost everything.
Great point. I bought a broken Samsung phone at the pawn shop for $5. It won’t access wireless but will store whatever I download into it. (I guess sync is the correct term?).
If it’s on youtube I can rip it into the device.