Just listed my SP MK3/HP108 in the Regulators Classifieds. Here's a link:
http://www.scubaboard.com/forums/classifieds-regulators/380122-scubapro-mk3-hp108-regulator.html
http://www.scubaboard.com/forums/classifieds-regulators/380122-scubapro-mk3-hp108-regulator.html