Steam CD-Key

Guys is there anyway to get a free steam cd-key for CSS i really want one.
My friend let me borrow the game but i just need a cd-key for it.

Go to a illegal site or just buy the god damn game, it's barely worth 25 bucks.

stfu ass -.- there are no illegal sites that just give you valid steam accounts,
the only way to play without paying is to use cracked servers