Is the $100K per kilo based on rocket technology? I'd be very interested in other delivery mechanisms that would be too harsh for humans or electronic equipment, but would work fine on ice or liquid water. I remember the Canadian who was working on Saddam's Supergun originally started his work on using artillery to shoot things into orbit. Since the massive acceleration from such a gun would not be an issue for simple, raw materials, what do you suppose the cost per kilogram would be?
http://www.allbusiness.com/professional-scientific/scientific-research-development/336939-1.html#
In 1992, it cost $20K per payload kilo while a supergun could do the same job for $500, or about 2.5 percent of the cost of a shuttle launch. If the cost per launch is $100K now (a number I ran across in the past year or so) it would still only cost about $2500.