Grand Theft Auto V is current been offered for free on the Epic Games Store. If you claim the game during the next week you can keep it for free permanently. It's also worth noting that this is the game's Premium Edition, which includes $1,000,000 of bonus cash for GTA Online.
The Grand Theft Auto V: Premium Edition includes the complete GTAV story, Grand Theft Auto Online and all existing gameplay upgrades and content. You’ll also get the Criminal Enterprise Starter Pack, the fastest way to jumpstart your criminal empire in GTA Online.
Download: Grand Theft Auto V on the Epic Games Store