I'm not sure if this is an appropriate place to post this, or even if it is a particularly good deal. But I have never seen such a cheap Gameboy Advance game sold new in my neck of the woods.
If you are into RPGs you might want to swing by your local Toys R Us and pick one up.
Game site:
http://sword.gameboy.com/launch/index.html
Rarity Guide description:
http://www.digitpress.com/DP/cmf/game.cmf?gameid=21100