How much was the first computer?

Cost of the first computer? You have to be more specific.
The first digital computer?
The first electric analog computer?
The first "personal" computer (PET)?

The first mechanical analog computer?

The earliest computers were room-sized machines that cost millions of dollars. The earliest ones rented for $2700 to $115,000 per month! The first mini computer sold for about $20,000. In 1977, Apple made a home computer and sold it for about $1,200. When I got my first computer, a Commodore 64, in the early 1980s, I paid about $600 for it.

Check these sites for more information about computer history.

http://www.pbs.org/nerds/timeline/

http://www.pc-history.org/comm.htm