Z-Man Games is bringing you an all-in-one box for Rattus with the Rattus: Big Box. It's got the core game, plus the Pied Piper Expansion, Africanus Expansion, and Academicus Expansion. And that's not even all, as there's special releases and promos that are in there as well. If you're wanting it all and in one place, this is the set for you.
From the article:
The Black Death has reached Europe and it’s up to you to save your people. In Rattus: Big Box players work to keep their populations alive while settling the various regions of Europe.
Using peasants you can increase your population, while monks are able to keep the rats away. Your merchants will pick up and flee when the plague starts to encroach on them and your knights spread the disease to new areas. Fiendish witches use magic to control the spread and the kings simply avoid the Black Death by staying in their lofty castles. Make no mistake, the plague does not discriminate.