By comparison, a unit cost for a Boeing 747-8 is around $330 Million, vs the around $1,000 Million for a full production run B-2. Just remember the 747 cost does not include the R&D costs of the decade it took to develop the design and build the factory, etc, whereas the full R&D cost is part of the B-2 cost. If you strip out the development costs, a B-2 airframe runs around $600 M, roughly twice the 747 costs for an aircraft with much, much more, very specialized capability. Overall, not a bad price for what it can do - haul 20+ tons of weapons 8,000+ miles unrefuled, invisibly, and hit a 3 foot circle. Many of them.