You can find these saves on dedicated game modding and save-game archives. They are often compressed in a .zip or .rar file. Here are a few reliable sources to get you started:

Extracted files meant to be imported directly into an existing virtual memory card profile.

Thus, you need a save file specifically ripped from a PS2 memory card or converted to the raw .ps2 format.

Look for files labeled "100% Complete" or "Master Save" by contributors like vicetovirtue or Victor_Bless . 2. Import into PCSX2

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Maximum respect from gang members and maximum sex appeal. How to Install a GTA San Andreas 100% Save Game on PCSX2

You will never run out of bullets for any weapon.

The Ultimate Guide to Grand Theft Auto: San Andreas 100% Completion Saves for PCSX2

The reasons vary, but they all boil down to one thing: