In the move 2 years ago I lost that green plug that fits on the power supply. Is there an alternative that will fit my MiniDSP?
Have you looked at Mouser or DigiKey? I would contact MiniDSP and ask them who made it. I suspect it is pretty standard and you can buy it from a number of sources.
I think a search for "euroblock" connector should give you what you need, cheap off eBay or whatever