You could cut the plug (leave some wire) off some old, broken appliance. That cord would have 2 or 3 wires. Split, skin the ends, connect Black/red to black/red. Connect white to white. If there's a bare wire attached to the fixture, and a green/bare wire with the old plug, they'd go together.
Don't put your fingers in the empty sockets when you plug this in, first without the bulbs. to ensure you haven't nicked a wire, etc. and thus, have a dead short.
If you plug it in uneventfully (as should be) you're all set.
Always work on a dry surface when dealing w/electricity. You'd want those wires taped up well with something non-conductive, like black electrical tape, or other. I ooze a drop or two of super glue on the wire and allow it to dry, then tape.