MOABs are essentially built in-house with available (think DRMO ish) parts.I do not know about $16 million (I had heard that too), but NO way it is $170,000. Hell, the casing probably cost a couple million.
Seeker head, fins and wings are purchased. So 170K could be argued either way (more or less $).
Lot of brainpower at Hill AFB and Dugway Proving Grounds.