B&H is selling the QNAP TS-231P 2-Bay NAS Enclosure for $119. Shipping is free.
Link: https://www.bhphotovide
This is a basic 2-Bay NAS which will handle all of your file serving purposes. It will not handle on the fly plex video transcoding, only direct play
Full specs and information can be found here: https://www.qnap.com/en-us/product/ts-231p