Call of duty 4 key code problem

[gaminglol001]

i want to play the newest call of duty 4 game produced by infinity ward.i have sew some video online.so exiting.but the sale price is almost 100$ ,so expensive.
but when i check some sites which sell call of duty 4,i find it is a bit cheaper.
so i want to shop online,but which one is better?give me some suggestion,plz....
1:amazon.com : link:
http://www.amazon.com/Call-Duty-4-M..._1?ie=UTF8&s=videogames&qid=1196160692&sr=1-1

price: usd 59.99

2: gamespot.com : link :
http://www.gamestop.com/product.asp?product_id=200336
price: usd 59.99
3:bestbuy.com link : http://www.bestbuy.com/site/olspa...uty+4&lp=1&type=product&cp=1&id=1186004730775
price: usd 50
4:cdkey-game.com : link:
http://www.cdkey-game.com/call-duty-p-335.html
price: usd 47.95
5?steam : link :
http://storefront.steampowered.com/v/index.php?area=all&initial=1&cc=CN
price: usd 49.95

thank u!

 

[Brad]

I would go with bestbuy, gamespot or amazon, just because of the names. I don't know the other stores so I would shy away from them.

 

[epk]

yeah ^ ^... or steam if u like...

 

[Shamus MacNoob]

what he said Steam works great for games

 

[gaminglol001]

what he said Steam works great for games

steam also sell pc game keys.

 

[gaminglol001]

i got keys from www.cdkey-game.com .nice keys and nice price.