Old World is currently on sale in the Epic Games Store, it costs only 29.69€ instead of 32.99€.
You can find this offer directly in the Epic Games Store: https://www.epicgames.com/store/en-US/p/old-world
The Civ6 Anthology edition is also on sale at both Steam and the Epic Games Store. It is discounted from 99.99€ down to 35€. You can find this offer for the next 10 days here: https://store.2k.com/en/game/buy-civilization-vi-anthology