Is it extremely difficult to have a password protected page on my website? Only one of the pages?

I.e if I am selling something and the marketing campaign has an exclusivity element .. can one of the pages be password protected with opaque/censored viewing of what this page could be about whilst other pages being accessed without a password

E.g home page, about me, work with me page etc all open

But new product line page.. password protected with teaser/opaque background. Impossible to do this cheaply?