Currently this NAS is $299 on Amazon. https://www.amazon.com/TerraMaster-F4-220-Transcoding-Network-Diskless/dp/B01G1YI0NC
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Here is the manufacturers page - https://www.terra-master.com/us/products/homesoho-nas/f4-220.html selling for $369.99
I bought this on Black Friday and set it up a week later. It comes stock with 4 bays, but it actually can be expanded to 5 bays. Not all of this model have the 5 bay option, but this one does. You can YouTube the model number to see the 5 bay option.
It comes with 2gb of RAM but can be upgraded for another 2gb for about $20. It is powerful enough to run a PLEX server and it can transcode up to 4k media.
If you are adventurous, its firmware can be upgraded to Xpenology, which allows it to run an open source variety of Synology NAS software. I didn't do that, but did determine it is compatible. xpenology.com
The reason I am selling is that I created a windows based server. I was going to put in some older 2tb drives and run RAID, but with the 8tb drives, I really don't need 4 bays at all anymore, so my needs are met with the new drives I got with an existing PC.
This NAS comes with built in PLEX capabilities and remote access to whatever is connected to it. It also has backup software built in.
It has literally run for just 2 weeks, and is in brand new condition. I stopped using it in December, but now I need to get rid of it.