Do you have to get a coffee grinder if you get a coffee press?

No, you don't have to. But you will have to buy ground coffee, which is not as fresh tasting as home-ground coffee. :)

Right, home-ground coffee may be more tasteful than saleing ground coffee. Because Ground coffee deteriorates faster than roasted beans because of the greater surface area exposed to oxygen.

If you are a coffee lover, you HAVE TO get a coffee grinder. In general you will notice the difference fast!