Cities: Skylines Humble Bundle contains six years of DLC
My favourite kind of Humble Bundle isn't a collection of games, most of which I'll never get round to playing. It's a bundle of a single game I like with lots and lots of discounted DLC.
Enter the Cities Skylines Colossal Collection, which offers up Cities: Skylines, 9 expansions and 21 add-ons for £16.22/$20/€18.95.