Square Enix launched Final Fantasy IV today
for iOS at a premium price, but if you're looking for other classic Square Enix RPGs for less, the company is having a mega sale on most of its iOS titles.
Classic RPG highlights include Chrono Trigger
for $7 ($2 off), Final Fantasy Tactics: The War of the Lions
($8 and $9 on iPhone and iPad, respectively, normally $16 and $18) and The World Ends With You: Solo Remix
for $13 on iPhone and $14 on iPad. There's many more titles on discount, check them all out on Square Enix's site