The PlayStation Network has a sale on most available Final Fantasy games. All the PS1 Final Fantasy games are down to $8.45 from the usual $15.95, giving you the perfect excuse to relive some of the best games of a couple of generations ago.
Also, for PlayStation Plus members, all of these games have an additional 10% discount, with the addition of Final Fantasy V going for the very low price of $0 - aka free.
These Final Fantasy games are compatible with the PS3 and PSP, and future support for the Vita should be available as well.
PSP Final Fantasy games are also on sale, which could be worth a look if wanting to stock up on more games to play for your PSP or for the Vita on release.
Check these deals on your PSP, PS3 or PC for more info.
Remember Final Fantasy IV, V and VI on the PSOne had terrible, terrible loading times.
As these are straight ports they also have this issues despite running from the hard drive.
Still - bargain!