If it exists, there's merchandise of it. NO EXCEPTIONS! ...Just kidding. You can find most of these at your local comic book store, or from online merchants. The best place to buy these is GKWorld.

Official keychain

These nifty little 2 inch keychains come in a set of seven (minus Quina) at $17.95, or you can buy them individually at $4.95. Sir Fratley not included.

Banpresto keychain

Much bigger than their official counterparts (being at around 4 - 5 inches tall), these ones are a lot harder to find and thus are more expensive, a whole set costing at around $59.95.

Postcard

Ahh, writing to friends and family have never been more fun with these spiffy postcards. You can purchase a whole set of 5" x 7" postcards for $9.95.

Action figure

A must have for any die hard Freya fan! Unfortunately, these are becoming extremely rare to find as later Final Fantasy characters come into circulation, and any avaliable won't always ship out to your location. If anyone can pinpoint me to a Freya figure that ships out to the UK, let me know.