[PC] Steam - Total War Medieval Collection £1.75 (~$2.87 AUD) - 2Game UK

Within a few cents of the all time lowest price for this game.

From the website:

Medieval: Total War Collection is the compilation of the critically-acclaimed Medieval: Total War and its official expansion pack - Viking Invasion. Set in the turbulent Middle Ages, Medieval puts you in command of your own empire as you crush neighboring kingdoms and unify all of Europe, the Mediterranean, and the Middle East.
Medieval - Viking Invasion takes the battle back in time to the Dark Ages of England, when the Viking invaders brought ruin and slaughter to the English coast. Play as one of the English factions and repel the invaders or unify England under a Viking banner.
In both games, you rule all aspects of your kingdom throughout centuries of medieval warfare. Lay siege to mighty fortresses and command vast armies across the battlefields of Europe and North Africa.

• Richly detailed battles that feature thousands of 3D units and intense combat.
• Manage the economic, civil, religious and military arms of your empire.
• Over 100 different units, including knights, men-at-arms, English longbowmen, and more.
• Spectacular sieges, as you pound castles into dust with cannons, catapults, and ballistae.
• Multiplayer battles with up to seven other players over the Internet.

Enjoy!