cs account activate,cs key problem

[gaminglol001]

i want to buy counter-strike:source cd key online to activate my steam account.i googled on the net and find 5 of the online stores available,but which one is better?pls help me make a decision.

1：gamespot:http://www.gamestop.com/product.asp?product%5Fid=646344
price: usd 29.9

2:steam,link:http://storefront.steampowered.com/v2/index.php?area=game&AppId=240&cc=CN
price: usd 19.95

3:amazon.com:http://www.amazon.com/s/ref=nb_ss_gw/104-6551671-9835136?url=search-alias%3Daps&field-keywords=counter-strike&x=20&y=15
price: usd 27.9

4:cdkey-game.com:http://www.cdkey-game.com/counterstrike-anthology-p-229.html
price:11.99

5:bestbuy,link:http://www.bestbuy.com/site/olspage.jsp?skuId=7453383&st=counter+strike&lp=1&type=product&cp=1&id=1125238535884
price:29.99

thanks for your help!

[CampStaff]

i want to buy counter-strike:source cd key online to activate my steam account.i googled on the net and find 5 of the online stores available,but which one is better?pls help me make a decision.

2:steam,link:http://storefront.steampowered.com/v2/index.php?area=game&AppId=240&cc=CN
price: usd 19.95

[Lisa]

Uhm.. you want to buy Counter-Strike: Source, don't you?

However, I'd just get it via Steam (store), yes.

[x3]

Safest bet is via Steam, click the Store tab and use a credit/debt card to purchase.

Quite a lot of cases with none affiliates sites are that the same keys are given out more than once which makes them useless for online play.