How to get Unlimited Gil in FF7
This is one of the oldest tricks in the book for earning an insane amount of Gil in Final Fantasy 7. To summarize it in one sentence, a mastered All Materia sells for 1.4mil Gil to a vendor. Many of the Materia in this game once mastered have a high sell prize but they're all less common or harder to master than the All Materia.
Players can master an All Materia rather easily once they make it to Junon/Costa del Sol by using the Junon Disc 1 Leveling Location that many people use. This will give you enough Gil to make it through the entire game without ever having to worry about money again.
That's really all there is to say about this trick. If you need some tips on where you can quickly master your All Materia as well as any other Materia you have, I recommend you check out my guides below.
Disc 1 - Junon Leveling Location
Disc 1 - Area Around Mideel Leveling Location
Disc 2 - Mideel Leveling Location
Disc 2 - Sunken Gelnika Source Farming + Leveling
Disc 3 - Northern Crater Leveling Location