I am replacing a rear light on my car (99 Almera) and it is costing €126 for the part alone (tried roughly 30 scrap dealers in Dublin, Donegal, Wexford and Louth, and micksgarage.com did not respond to my e-mail with availability), so I would imagine a headlamp could cost over and above €200?
Incidentally I am sweating on my car passing the NCT with 2 small chips in the windscreen. One of them was there when I bought the car, but the garage wouldn't replace it (I did get €500 off the price at the time), and told me to claim off my insurance. I am insured with Quinn Direct, who do not provide windscreen cover, so I would have to pay around €400 to have it replaced. Based on anecdotal evidence, when deciding whether to pass/fail, the tester should consider whether the chip will turn into a crack. Both the chips have been in my screen for over 18 months, and have not got any larger.