I just spoke to my bro-in-law and they booked thru:
Natural Habitat Advetures in Boulder, Co.
Who then booked their trip with
Unique Safari's in Tanzania... who then sub-contracted for porters & guides for the actual trip...
He said you may get a better rate by cutting out the middle man and booking directly with Unique Safari's...
He highly reccommended them as very professional and competant...
Their trip included a 3 day safari after the climb... that they said was "an experience of a lifetime"...
I do not know their overall cost, but it
wasn't cheap!...
BTW,
My bro-in-law is a Captain in the Air Force stationed at the Academy in Colorado Springs, in the Hospital there.
He's an Anesthesiologist...
And an accomplished climber, having climbed most of the 53 14,000+ foot peaks in Colorado...