Half life 2 No cd

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I was just wondering does anyone know where or when i can get a no cd check for my retail halflife 2 game

its rediculous that we retail buyers need the halflife 2 cd inorder to play but where as if you bought it online you don't...
and what makes it worse is that i am a regular player of cs:s and if i do this disk in disk out business i'm gonna someday damage it and then i can't play anymore..

can anyone help?