You will find on this page photos of CPC/PCW/NC and hardware add-on (the first photos comes from MO5). With some luck you will be able to order what you find here at Merline-Serve or you can try to put a free ads in the french newspaper Les Puces informatiques.

image on an Amstrad AMX mouse AMX Mouse
image of the Amstrad SSA1, a vocal synthetizer Amstrad SSA1, a vocal synthetizer, which could be programmed in basic. I have a TechniMusique vocal synthetizer
image of the Amstrad RS232 serial interface Amstrad RS-232 C serial interface. It can be used with CPC/IP, to send/receive files from another computer or to use your CPC as a linux terminal.
image of an Amstrad optical pen Optical pen for colour screen only, it came with a drawing program.
What is the exact reference ?
image of an Amstrad DMP-2000 printer The matricial DMP-2000 printer.
image of scart adaptator for Amstrad CPC Scart adaptator for using a television instead of the CPC screen. Comes in two flavour :
MP-1 for the CPC 464
MP-2 for the CPC 664/6128
image of an Amstrad joystick A joystick.