Half Life is the game that revolutionized the FPS and defined Valve. An excellent offering with a clever b-movie inspired plot, great pacing, cinematic sensibilities, impressive AI, iconic enemies, unique weapons, lovely graphics and everyone's favourite bespectacled action hero. A game that was one of Sierra's last publishing successes.
To grab a copy of the thing, you can bid on this pretty impressive Half Life & GOTY CD (PC) eBay auction. The game comes complete in its box with the lovely addition of a CD sporting the Game Of The Year edition content of Half Life.
Seller ships worldwide.