You are off by at least an order of magnitude in your price estimates, milspec rugged robots are expensive but on the order of $30,000 - $100,000 each not $1 million. Now those are complex systems with articulated arms, complex comms, and full control station style remote. If the military spec'd out a simple system, like the one in this article, it would cost much less. An existing contractor like iRobot would be perfectly capable of producing it at a low cost. They make the existing pack bots used by the military as well as cheaper consumer grade robots like the Roomba.