If you don't have a crafter/gatherer, your best options are Leves, Diadem and your GC.
If you don't use leves often, then the leve grind for Ambers can get you ~20 on a good run
Diadem gives so many useless elemental IV materias that you can get them switched for sands within a fairly reasonable amount of time.
You could also go for moonstone via your GC. They cost about 4k seals but seals are easy to get by trading in gear you no longer need, hunts, etc.
Also, people need to chill out on these forums. Seriously, just because you feel differently about the topic doesn't mean you can belittle people that aren't having as easy a time as you did.