[Junior]

I found an ancient article dealing with this:

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.

[doc30]

If that's the case, let's start building really, really big guns!!