If You're talking about cs1.6, the best to have it is to: Go in a games store, like ebgames, microplay or something like that, and buy half-life:blue-shift. That cost 5$. And download steam on http://store.steampowered.com/ and add your cd-key. If you're talking of cs:cz you should buy it on internet with a credit card, that's less expensive. If finnaly if youre talking about cssource you should buy it in a games store :Dsry for my english, I hope you understand