Intro: All the Link Wire You'll Ever Need . . . for FREE!
Did you know there's 50 metres (160 feet) of high quality stranded multicolour electronics link wire sitting in your "Computer Things Which Will Come In Useful One Day" box at this very moment? It's that old parallel printer lead which you junked when you got the new USB printer.
To get to the wire, all you have to do is cut off the connectors and cut along the length of the cable enough to get a good grip on the wires inside, then pull the cable and insulation apart. You now have 25 x 2 metre lengths of link wire in all the colours of the rainbow (and a few more) which tins easily and doesn't shrink when soldering. That's enough for a fair few projects.
Some laser cutters and 3-D printers use a parallel connection so it may be wise to hang on to a lead if you're thinking of getting one.