[El Gato]

Low cost? I understand that each kit sells for over $20K(US).

Compared to the cost of other precision guided weapons, that's dirt cheap. Although laser guided bombs are about the same IIRC, and those are also kits that attach to regular "dumb bombs". Since the precision means less sorties, flight hours are really expensive, we probably save money by using them instead of dumb bombs. Not to mention putting fewer crews at risk, or the same crews fewer times.

[egarvue]

I also hear that many of the dumb bomb's the JDAM kit is being used on are old Vietnam-era stock still left over.