I did that around 1.5 years ago. I was at the thrift store and found an MP3 player "SanDisk Clip Sport Go" for $2.99, modded it to increase the memory from 32GB to 256GB, and now I have all my music there in a very small form factor that I had to put an AirTag on to find it! It also has FM radio, a screen, actual buttons, and the battery lasts a week with normal use. It doesn't have Bluetooth; however, I just attach a Bluetooth dongle "1Mii Safefly Pro" and can pretty much have high-quality audio to my speakers and headphones or even my car, and yes, I also found that dongle for $3.99 at the thrift store. Both are less than one month's subscription.