the components are available at electronics spareparts store
ask for it as "usb mp3 player module"
components available with the 4$ board:
2.female usb port
3.I R sensor
1.female audio jack
2.I C 7805 voltage regulator
3.connecting wires(for antenna---- long ordinary wire strip)
you can connect the audio jack to that of a speaker and listen it through that also....
all the best.... :-)
4.any suitable case for the board to fit in... just a small match box size is enough with a space for 9V batter attachable with it....