Where Can I Download The Sims 3?

My cousins have recently installed The Sims 3 on their computer, they bought the game from the internet.
I want to buy and download it to my computer but I don't know the website address.
Where can I buy and download the game from?

I suggest you buy it on Steam, it is a great platform for online gaming. Besides they have offers all the time and you can buy the game for a few bucks.
I bought mine recently and it's awesome.

Just buy the game from EA's official website. It is not expensive and it is an incredible game.