: You can buy the GTA: The Trilogy – The Definitive Edition which includes GTA III, Vice City, and San Andreas with updated graphics and controls.
: The Definitive Edition is available for purchase here. gta-3-pc-game-links
Grand Theft Auto III - The Improved Classic - Steam Community : You can buy the GTA: The Trilogy
Finding Grand Theft Auto III (GTA III) for PC today usually involves choosing between the modern or finding ways to run the Original (Vanilla) version, which is no longer officially sold on many digital storefronts. Official Purchase Links gta-3-pc-game-links
: The official Rockstar Games Launcher is another primary source for digital copies.