I think this is the cheapest it's been on PC (correct if I'm wrong).
Hope it helps someone.
Mortal Kombat XL includes:
Mortal Kombat X
Kombat Pack 2
About Mortal Kombat X
Who’s Next? Experience the Next Generation of the #1 Fighting Franchise.
Mortal Kombat X combines unparalleled, cinematic presentation with all new gameplay. For the first time, players can choose from multiple variations of each character impacting both strategy and fighting style.
About Kombat Pack:
Kombat Pack grants early access to 4 upcoming playable characters and skin packs. Slash your opponents as Horror Icon Jason Voorhees, or play as Predator, the Ultimate Hunter. Klassic characters Tanya and Tremor complete the offer. Each fighter comes with a themed skin pack including three new skins for select characters. Also includes The Samurai Pack.
About Kombat Pack 2:
Kombat Pack 2 grants access to 4 new playable characters, as well as previously released content including Goro, Kold War Skin Pack and 2 Klassic Fatality Packs. New characters include Horror icon Leatherface, and the Xenomorph from Alien . Bo’ Rai Cho and Triborg the Cyber Ninja complete the offer. Also includes the Apocalypse Pack with three new character skins.