Mortal Kombat X is one of the most discounted new releases I've ever seen and is only £10.44/$17 on PC today. It's pretty damn great too. Even the Premium Edition is only £15.19/$23.
Take a look at my Mortal Kombat X review for a full report. I can tell you now that fighter fans should be all over this one. The combat is super smooth and incredibly meaty and the story mode is surprisingly strong, giving you a taste of multiple characters. There's tonnes to do after the story too, with challenge towers with crazy match modifiers and hundreds of items to unlock in the Krypt. I've also reviewed the Jason Voorhees DLC (he's pretty damn good).