Been looking for a all(almost) in one Cities: Skylines collection for a while now at discounted prices. Not sure how much you'd save but $28.73 for the entire set is pretty awesome.
- 9 expansions—everything up through 2021’s Sunset Harbor
- 21 add-ons—featuring Content Creator packs, new music, and the Deluxe Edition Upgrade
- Bonus deal! Complete your collection with 20% off a pack featuring the most recent expansion Airports & the all add-ons released this year so far.(Basically its a coupon for 20% off this https://www.humblebundle.com/store/cities-skylines-2022-dlc-... which you have to purchase separately)
- Redeem on Steam or the Epic Games Store. All of the games in this bundle are available on Steam for Windows, Mac, and Linux and on the Epic Games Store for Windows only.