ChoicesUK are selling "Final Fantasy XI Online 2007 Deluxe Edition" for the PC for £1.99 (inc Del.)
You can get cashback on this through the usual sites (e.g. 5% Quidco, making it £1.89)
The next best price seems to be £12.99 from PowerPlayDirect.
This game contains:
- The original, award winning online role-playing game
- Free 30 day subscription to play Final Fantasy XI
- The Rise of the Zilart Expansion Pack
- The Chains of Promathia Expansion Pack
- The Treasures of Aht Urhgan Expansion Pack
Choose a home in one of three unique nations - the Republic of Bastok, the Kingdom of San d'Oria or the Federation of Windurst - and set off on a series of adventures across the vast world of Vana'diel. Travel through more than 100 regions, from forests to ice plains, deserts to oceans, using a variety of vehicles such as airships, boats, and tame Chocobos. The immersive storyline incorporates quests, missions and battles with non-combat skills, including leatherworking, alchemy, fishing and jewel crafting. Interaction and communication is key to the creation of a new fate for all Vana'diel.