I've been looking out for a Wii Microphone for an xmas prezzie. The cheapest I can find is £13-14 (apart from Zavvi/TheHut, who I've had an order with for a mic for over a month and have just found out they don't have it in stock). At amazon you can get the microphone with Disney Sing It: High School Musical 3 - Senior Year.
I'm possibly going to sell the game on as I suspect that she already has it.
Still a great price for a Mic and Game bundle.