If You're looking for 100% legitimacy, and lower prices than ANY other gil selling website... Ssegold.com is the site for you! Their prices keep going down, and down! And delivery is 15 minutes or less, if it isn't instant! I recommend thia website to anyone, and everyone! :)
I'm a FFXIV player, and I've purchased Gil from MmoGah.com multiple times, and they're legit! The service it fast, and great! Wait time has always been less then 10 minutes every time! I'd recommend it to all my friends who I play with :) I will continue buying from MmoGah.com, always!