It depends on what you mean by “found”.

If you are talking about the simple act of incorporating a US company in Delaware, the total cost is $89.

If you are talking about everything it takes for a business to get up and operating, in 2009 the Kauffman Foundation estimated the cost at $30,000.

If you're talking about the basic formation, administrative, legal and tax stuff required to correctly set up a company that is planning to grow big with outside capital and equity-compensated employees, then it's somewhere in the $500–$5,000 range depending on how you go about doing it.