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This is a very good price for a 3 month old game, though apparently it's multiplayer component isn't that popular. Don't forget to use the 20% off code to lower the price to just over $4 AU: GMG20-ZB5D1-93X49
Some other specials: Fantasy Wars $3.75 http://www.greenmangaming.com/s/au/en/pc/games/strategy/fant…
RUSE $2.50 http://www.greenmangaming.com/s/au/en/pc/games/strategy/ruse…
(currently $25 on Steam's store)
Real Warfare $2.50 http://www.greenmangaming.com/s/au/en/pc/games/strategy/real…
Real Warfare 2 for $2.50 http://www.greenmangaming.com/s/au/en/pc/games/strategy/real…
Reign Conflict of Nations $3.75 http://www.greenmangaming.com/s/au/en/pc/games/strategy/reig…
UFO Afterlight $3.75 http://www.greenmangaming.com/s/au/en/pc/games/strategy/ufo-…
Theatre of War $2 http://www.greenmangaming.com/s/au/en/pc/games/strategy/thea…
UFO Aftermath, UFO Aftershock and XIII are also on special, but require something called the Capsule client, which I am unfamiliar with.