Just stumbled across this offer at GAME,
You can get the Wii Light Gun, which is like the Wii Zapper for only £4.99 when you buy Ghostsquad, It could possibly work out as £1.99 if you use the £3 off £30 voucher.
Bargain i think when the wii zapper alone costs £19.99 in most places.
Plus quidco and reward card points could bring it down even further!!!!