The Fiio DM13 is pretty cool and has really nice specs and compatibility with all sorts of headphones, even Bluetooth, but it’s quite pricey at about 150€. My suggestion for lower priced stuff would honestly be to go to aliexpress, check for something that matches your requirements (e.g. Bluetooth for Bluetooth headphones, battery life, format, etc.). I suspect that buying western brands will just be a rip off

The old Sony discman with lots of seconds of dsp or jog protection are good.

E: there’s a d-ej360 on eBay for less than $50 and that’s a good one.