“It currently costs about $100,000 to send a standard 3-pound satellite into low Earth orbit. Larger masses can be a little bit more affordable, but can still cost up to $5,000 per pound. Lucky for the human race, there are smart people out there trying to solve this problem. One company, HyperV Technologies Corp., has proposed a ‘railroad to space using a mechanical hypervelocity launcher to enable large-scale space utilization’ that will be only one-hundredth of the cost of the rockets we currently use. Fancy, I know. They’re calling it the Slingatron.”
http://dailyreckoning.com/railroad-to-space-a-lower-cost-leap-into-the-stars/