According to ITAD this is within cents of the all-time lowest price so this is a pretty good price for this game.
Only lasts another four hours or so as it is a flash deal - so if you want it be quick.
Enjoy!
From the website:
Marvel and Capcom join forces to deliver the most frenetic 3 vs. 3 tag battles ever with Ultimate Marvel vs. Capcom 3. This release comes fully loaded, including all previous DLC, and the Marvel vs. Capcom: Official Complete Works. Select some of the most iconic Marvel and Capcom characters, and customize your team with "Heroes and Heralds" mode. Once you've honed your skills, hop online and go head-to-head against players from around the world to see who is the strongest in the universe.