Z4 Coil Pack - How much?

Hi Guys,

So my 3.0 2004 Z4 got a misfire this morning and the check engine light came on.

I suspect I need to replace one of the coil packs. Does anyone know the rough amount I can expect to part with (for part and labour).

Also is it worth going to BMW or is it a simple enough fix for an indy to do?

I am based in CT, would be grateful for any suggestions

Thanks