Audi TT headlight needed

[jep]

Right, car's in for an MOT, and what I thought was a simple bulb replacement has now turned into a complete headlight and control unit replacement. I've been quoted £678 +VAT, which is somewhat eye-watering! Does anyone have a unit, either 2nd hand, or a good supplier that I can contact for a cheaper price. I need to get it delivered for either overnight, or by Friday...

PM's if poss, as any help is greatly appreciated!