Unit Cost:
AC-130H, $132.4 million;
AC-130U, $190 million (fiscal 2001 constant dollars)
SOURCE
The only problem with using the AC-130 is that it can only, under USAF SOPs, be used at night-
Soon after eliminating the target designated by the Marines, a lone Iraqi hoisted an SA-7 "Grail" manportable surface-to-air missile to his shoulder. In the dawn of the early morning light, the form of the large AC-130 slowly became visible in the skies over Khafji. The decision to remain behind to support the Marines cost the pilots and crew of Spirit 03 their best defensive weapon - darkness. The Iraqi pointed the weapon at the aircraft, and fired. The missile found its target and at 0635 hours the aircraft sent out a "mayday" distress call and then crashed into the waters of the Persian Gulf. All 14 crewmembers were killed
SOURCE
Would be fanatastic if we had them though.