SoftUK is selling "Supreme Commander Gold" for the PC for £5.99.
You can get free delivery by entering the code "cheap games" (without quotes).
A few sites will give cashback on top of this (e.g. 2% from FreeFivers, making it £5.87).
Next best price is £9.99 from Zavvi.
Contains Supreme Commander and Supreme Commander: Forged Alliance expansion.
For a thousand years, three opposing forces have waged war for what they believe is true. There can be no room for compromise: Their way is the only way. Dubbed The Infinite War, this devastating conflict has taken its toll on a once peaceful galaxy and has only served to deepen the hatred between the factions.
After centuries of struggle, the battle for supremacy has at last reached a turning point. Under your strategic command and leadership, only one faction will reign supreme. Will you be victorious and elevate your race to domination? Or will you lead them into the hell of defeat and ultimate extinction?
Delivering one of the most advanced and innovative features of any RTS game, Supreme Commander establishes a breathtaking new standard for sheer scope and scale of gameplay. Massive battles unfold across maps of unparalleled size and scope and thousands of units fight to the bitter end.
Scale: Witness tiny assault bots get crushed underfoot by towering mega units, or watch as smaller attack bombers try in desperation to bring down a gigantic experimental unit.
Scope: Concentrate on individual ground battles or zoom all the way out in a single, seamless motion that reveals the full theatre of war. Plan and unleash multiple strategic attacks from this strategic vantage point.
Dominate your enemies by coordinating strategic ground, naval and air attacks. Initiate a crippling air strike with your attack bombers and support them with a ground assault of heavy and light artillery that demolish the opposing factions main base. Exterminate your foes once and for all by sinking their aircraft carriers with a surprise submarine attack