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Hi Alex,
Faceplates vary from $100 US to $300 depending on size.The 4B is 200 and a set of handles is $100. The BP26 is $100, MPS2 $100 and the 3 knobs are $100. The DAC and CD Player are $100.
I would not recommend trying to change them in the field though as aligning the leds in the BDA one and the draw and leds in the CD Player is not an easy task. Also to change the amp faceplates you have to remove the heatsinks and disassemble the amplifier to get at the bolts that hold the faceplate on.
james