Anyone here knows where to buy legit ps1 games?

I have a working ps1 fat at home and I want to use it this term break namin (release some stress) and bring back the feel of console gaming. Problem ko lang is konti lang orig games ko. Modified naman unit ko but nothing beats original copies.

Tried olx and fb groups to no luck (puro Final Fantasy, Chrono cross and jap ver of games nakikita ko eh di ko naman hilig yan) Hirap talaga maghanap ng games sa old consoles (even accessories) halos wala ako makita na dual shock controller for ps1 (not the dual shock 2)

Games ko for ps1 so far:
Tetris
Syphon Filter 1
Gran Turismo 1
Sega (ata) greatest hits


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