As of 2015, it is not possible to legally play the game "Grand Theft Auto: San Andreas" for free online or via download. The game is available for purchase on the PlayStation 2 and Xbox game consoles, iOS and Android app stores and through digital distribution services such as Steam.
Rockstar Games, the developer of "Grand Theft Auto: San Andreas," features a section of its site dedicated to the game and the various purchasing options available. This section includes a list of all the platforms that currently support the game, including video game consoles, computer and mobile devices. By visiting this page and clicking on a platform, the user is able to find links to the different retail sites or distribution platforms that offer the game.
For example, a user interested in playing the game on an Android device is able to buy the game through either the Amazon Appstore for Android or the Google Play store. Similarly, a user seeking to play the game on a PlayStation 2 is able to find the game through either an online retailer or digitally through Sony's online distribution platform. In some cases, certain retailers may offer discounts or promotions that decrease the price of the game significantly, even making the game free, but these are at the discretion of the retailer.