Page layout and hide/show option

Hello all,

I’m all new to wordpress, and trying to build an easy-to-maintain website for someone. Please note it’s a “regular pages” website as opposed to a blog one.

I need most of the pages body to be made two “zones” one above the other, the second one being visible only when I decide so.

As an example, let’s say I sell oranges and bananas. I’d have a page for each. The upper part would describe oranges on one and bananas on the other. Whenever oranges are on sale,I would make the second “zone” of my oranges page visible and say “oranges are on sale”. As the content of that “oranges on sale” zone would barely change along time, I need something that I can quickly edit and show/hide when needed.

I found a rather horible way to do that using categories pages and switching post visibility, but I’s sure there’s a better and easy way to go. I’ve just haven’t googled it correctly I guess.

Any idea ?
Remember, I need something easy to use for the future administrator.

Thanks in advance for your help.
Mat