Check this link to find US Military Operating Costs.
http://www.dod.mil/comptroller/rates/fy2003.html It is interesting to note that US DOD published flying hour cost has not been updated since 2003!
The lowest number shown for UH-1H is $1400, but this includes the burden of logistics system (Supply and Depot) and crew cost.
Probable realistic figure for commercial operator would be $800-900 per hour.
When Bell makes Model 210 available next year with 212 dynamics and commercial TBO & Retirement double the Huey's it will likely be under $600.