Yesterday I managed to get a pack of wirenuts. An electronics company carries them. Translucent wing nuts in a pack of 50, cost 10 Euro!
Oh yes, and the guy from the shop said to me: "Do you _really_ want to buy these? You know, they used them at my son's, and half of the receptacles didn't work! Take strip connectors, they're better!"
For those of you who work or have worked in the US, is this expensive?

I doubt it was the wirenut's fault that the receptacles didn't work, it was rather the sparky who didn't tighten them.