How can I “sell” my CEO on purchasing a file server…

How can I “sell” my CEO on purchasing a file server. I do not have
any experience with upper management or their lingo. My company
does not have a file server and we need one desperately. But my
CEO wants to know why and how much money it will cost. I have a
looked around and think I am spending about $13,000 on one. I
think my CEO will get sticker shock and say no right away.