Use code winter-sale20-grogre for the £5.76 price.
It was briefly on the Steam sales for around £7 recently (and it's back to £10.19 again).
Alternatively, you can buy the complete game for £11.04 using the same code from GMG. This way you don't need to own Super SF 4 Arcade Edition. Will post link in comments.
Currently the cheapest way to upgrade your copy of Super Street Fighter 4 to the Ultra version.
- You must own Super Street Fighter IV Arcade Edition to utilize this content.
The world’s greatest fighting game evolves to a whole new level with Ultra Street Fighter IV. Continuing the tradition of excellence the series is known for, five new characters and six new stages have been added for even more fighting mayhem, with rebalanced gameplay and original modes topping off this ultimate offering. Get Ultra!
In Ultra Street Fighter IV, Poison, Hugo, Elena, Rolento and Decapre join the fight, complete with new animations and their own unique play styles, bringing the final roster count to a massive 44 characters. Six new battle environments (including Pitstop 109, Cosmic Elevator, Half Pipe and more) provide a thrilling and colorful backdrop to the action. In addition to the action-packed new content and the finely-tuned rebalanced gameplay, the new version features a host of new features and modes that are sure to test even the most well-traveled world warrior