I have listed some new old stock QL power connectors on SellMyRetro.com.
These are £12 each, including free worldwide shipping by airmail (or first class if you're in the US).
I only have a few available, so if you have a QL that would be perfect if only it wasn't for that broken power socket, you could snap one of these up and whip out your soldering iron and have a shiny brand new socket in just minutes!
You can find them here:
http://www.sellmyretro.com/offer/detail ... ector-2655