In the world of RPGs, the Final Fantasy games are arguably the best in the business. Currently the App Store offers Final Fantasy 1-6, along with Final Fantasy IV: The After Years, all for various prices.
Here's a list of price changes:
Unfortunately, Final Fantasy VII has yet to be ported to iOS, and we know a good amount of folks are waiting for that one. Square Enix has proven itself time and time again to push the envelope on mobile games and RPGs, so new fan or old, this price drop is a good place to start your iOS gaming career.