Mp3 player or dumbphone to listen to music?

So I'm tired of all the unethical and expensive music streaming plattforms and decided to switch to an mp3 player. I have no idea about this and idk where I should look. What brand should a mp3 player be? Sony? And how large should the memory be? 32gb? Is using an old Nokia phone better than an actual mp3 player? If yes what dumbphones would you recommend? Also is second hand a good idea? I'm not willing to pay more than 100€ for it. I want a good quality one with long lasting storage/ battery. Please help me