WOW payment help - Unsure of payment?

Firstly: You have to buy the original version, not any expansions. This costs around �10, but come with a free month of membership. From then on, you have to pay monthly, for �8.95 a month from the website, or �20 for 2 months from game, which means you don't need to enter credit card details. The first expansion, Burning Crusade, raises the level cap from 60 to 70. It cost around �7, but you can get the original game, along with Burning Crusade, for about �15 from game. This come with two free strategy guides. Next is Wrath on The Lich King. This raises the level cap to 80, and costs �10. The third and final expansion, Cataclysm, raised the max level from 80 to 85, and costs around �16. So, you have to buy the game, and pay monthly, but it's worth getting subscriptions every so often, as it's a really fun game!