where to buy PCM,Ford?

reasson I ask is that I have had problems with the battery going dead wit hthe car just sitting. I narrowed it down to a circuit that is for the Instrument cluster/PCM. It is to cold out to mess with it anymore tonight. I will unplug the computer in the morning and see if the draw goes away. If so, the PCM is what has the problem. Maybe it will be something else.
 
are you positive it isnt the battery itself? i would get a vat if i were you and loadtest it before you start replacing ecu's and what not