Adafruit Music Maker MP3 Shield for Arduino (MP3/Ogg/WAV...) : ID 1790 : $29.95 : Adafruit Industries, Unique & fun DIY electronics and kits
MP3 Player Shield Hookup - SparkFun Learn
Pass audio from input line to speaker output with Mp3 Shield VS1053 - Programming Questions - Arduino Forum
Buy MP3 Player VS1053 Shield - Shield for Arduino Botland - Robotic Shop
MP3 Player Shield Hookup Guide V15 - SparkFun Learn
VS1053 MP3 Shield - RoboticX
Amazon.com: SparkFun MP3 Player Shield- MP3 decoder- Turn Any Compatible with Arduino Board into a Fully Functional MP3 Player- 3.5mm Audio Out Jack- 0.1" Spaced Header for Speaker Out- microSD Card Slot :