I would soooo
love to run my C128D, but I can not find a power supply
for it - The use of the proprietary plug has been a pain, and I have
more than once been 'just about to' put a commonly available power
socket on to the box.
Huh? The 128D(CR) has an integrated power supply.
Perhaps you mean a flat 128?
Ahhhh - Yep - it is a flat 128.