Cost of the Afghan War

Before the United States commits itself to more troops in Afghanistan I would like to know how much I will have to pay for it out of my pocket.  If the number is zero, I will be confused (doesn't war cost something); if the number is something, I will be angry (why should I have to pay with funds that should have stayed in Afghanistan all along instead of Iraq); and if the number is undetermined I will be even angrier (only in Washington DC can you get away without a budget for something).