It depends where you are, we pay £20 just for slaughter and anything from £25-40 on top for basic butchery
:-( this is Aberdeenshire.
You can't sell it or give it away unless it's butchered in a licensed cutting plant/butchers, only feed it to yourself and immediate family living at the same address. Which means in places with either not much competition or butchers who don't really want the bother,,it can end up costing £££
Or you maybe lucky and find a good butcher or abbatoir do it inside for a good price.