depending on number of discs, why not just extract/convert? as i recall minidisc was a pcm file. just jack to any audio port and blam.
anyway quick search spits out $20/disc price
e.g.
http://www.minidisctocd.us/
http://www.mdconvert.com/
but a used player is just fitty dollah...
https://www.ebay.com/itm/Sony-Walkma...AOSwIPhd~pu Q