I assume you mean $39.99 each. GAWD I hate how Square inflates their DS games prices however the Wii version is a nice surprise. Is it confirmed that it is online capable or just local play?
I believe both versions are online enabled here's the Faqs from the PR email:
* Play anytime, anywhere with anyone! Multiplayer connectivity reaches new heights in FINAL FANTASY CRYSTAL CHRONICLES: Echoes of Time, where players can team up or compete with friends and players around the world
* The intuitive control scheme introduced in FINAL FANTASY CRYSTAL CHRONICLES: Ring of Fates® returns, now adapted to Wii for double the action
* Players can switch between single and multiplayer modes at any time while playing, enjoying two great gaming options in one integrated experience
* A personalized hero can be generated from a choice of the four familiar races of the series; Clavats, Lilties, Selkies or Yukes. Players joining from the Wii can also introduce their Miis to the world of FINAL FANTASY CRYSTAL CHRONICLES
* Create and customize materials, armor and equipment for characters with tailored appearances and abilities -- no two heroes will be the same!
* Players can continue to enjoy the game even after completing the main adventure, as the New Game+ feature provides increased difficulty and better items with every new round
* A vast selection of quests delivers hours of fun!