DIY For my Kids - RFID-based MP3 Player in less than 24 hours
Mp3 Player Module | Diy Mp3 Module | Dfplayer Mini | Decode Board | Dac Module - Mini Mp3 - Aliexpress
DIY MP3 player - $26 - Make:
Homemade MP3 Player with USB Support - EEWeb
Amazon.com: ALAMSCN Mini MP3 Player Module Dfplayer Audio Music Modules Voice Decode Board TF Card U Disk IO/Serial Port/AD Board with 2W 8Ohm Speaker Round for Arduino DIY (3pcs MP3 Player +