Where can I find/buy the thunder/thundara spell in FFXII?

Question

*spoilers?* im at the part when im just about to get my second summon, (that one ice lady aeon) and my characters are at a decent level, but i just need to know where to get these spells to make my life easier. Also it helps to know that it might help me later on in the game: so mind telling me where i could find/buy these spells? (also having in consideration my current circumstances)

*THE BEST ACCURATE ANSWER WILL RECIEVE BEST ANSWER*

Answer 1

this is really FFXII?
well its esper not aeon,
you can buy thunder quite early in the game...
for thunder, purchase it at yugri's magick (rabanastre)
for thundara, after the defeat of tiamat,
buy it from tetran (eruyt village)
or from the travelling merchant in mt bur omisace