Only place ive found the mpc modules was on Ebay...also check the forum here http://www.rivercityamps.com/electraforum/
there is a few there from time to time...
Hello all...Ive been lurking here for about 2 weeks now ,all I can say is WOW! So much valuable information. Thanks to everyone who shares. I have learned so much already. And to other Noobs...Search is your friend!