In The Island they state at various stages:
- Agnates - 'spare parts for people' are sold to the general public at the rate of $1,000,000 (1 million) per unit.
- The military has funded the research to the value of 120 billion dollars.
One would expect that if the military is funding it, it is to replace body parts for highly trained and very vulnerable military personnel. Spares for the marines, the pilots, the medics etc. A BOTE calculation would suggest that even if the military is getting their agnates at the same rate as the public, they would be expecting 120,000 units.
Where were those agnates kept?
The storage units seen in the film, high rise buildings, might have comfortably housed 1,000 each (50 per floor x 20 floors). But even at 1,000, that means 120 high rise buildings, and far fewer than that were depicted. Also, I do not recall seeing any obviously military agnates. There were supermodels & sports stars, a 'rich guy', a politician..