I have multiple 120GB Zunes, one being my original and the others I bought for cheap when everyone was dumping them for their phones. They all work fine. You do have to track down the software; I keep the executable on my local file share. I just found my old brown 30GB Zune in storage. It has music from a bunch of local bands from the area I grew up in that are irreplaceable. Unfortunately the software can't read it because the firmware is out of date, and it can't be updated without wiping the music off it, which defeats the purpose. There's a utility called zalternator that allows you to mount the zune as a disk but I haven't been able to find a copy anywhere. I was going to make a Windows XP VM and install the 1.1 version of the Zune software and see if that works. I digress, they do work still, with a bit of effort. MS could have brought it all back after GotG3 and cashed in, but nope!

After the 3rd (iirc) Guardians of the Galaxy movie referenced Zune, they have had a small resurgence