The parts cost me £14, postage is £2...not exactly making a fortune! People have said I should charge more, but I'm not in it to make a killing, I did it primarily to help people out (I originally had a thread detailing the wiring schematics, but was told to take it down for my own benefit). The £6 I make covers my time to make the harness (each one takes about 15 minutes), and pays for the time/ink/paper to write the comprehensive fittings instructions.
If you really are that reluctant to pay £22, PM me and I will show you where to get the parts and you can figure it out for yourself :)