Zagg Slim Book
If you want an iPad mini case that also includes a physical keyboard, the Zagg Slim Book is perhaps the best option.
Known as a "keyboard case," the Slim Book combines a keyboard with a normal iPad case, turning the iPad mini into a 7.9-inch laptop of sorts. You can remove the iPad from the keyboard anytime and reattach it with ease.
The keyboard includes backlit keys, which can be great for typing in the dark, and it has a battery life of around two years. A two-year battery life is incredible, and it essentially means you can charge it once and forget about it.
The Slim Book iPad mini keyboard case can be bought on Zagg's website for $89.