WWW.WAKEGIANT.COM has the 2005 LF Balance for $159.99, all sizes. That is the cheapest I've seen them anywhere. I am amazed when I see places like Overton's and The House sell these for $269. They are even asking $269 for 2004 models. I picked up an '04 at the end of '04 from Performance for only $219.
The key to finding the best deals on the net is to type in what you are looking for into Yahoo Shopping. That's how I found Wake Giant.
I'm pretty sure they used the Aero Core for 2004 as well. I have an '04 and it has the Aero Core logo on it?