Sansa Clip+ works nicely with MicroSD cards and you can buy them refurbished. Sound quality is great and the low impedance headphone output has minimal hiss even with sensitive IEMs while still being able to drive less-sensitive headphones to good levels.
The UI is kinda confusing and battery life isn't great, but it gets the job done.
I accidentally ran mine through my washing machine last week; let it dry out, and it still works!