Does a Wordpress Plugin Exist That Adds Custom Post Content Based on Category?

Here's what I want: a plugin that can post a different ad or display a different popup based on what category a user is browsing in. So if they happen to be in a lose weight category, they get an offer to them served for losing weight. If they happen to be in a golf swing category, you can post a gold swing offer or opt in.

Any idea if this exists?