Well, I just called my local EB to see if they got any Wavebirds in (they did - woohoo!), and was told that they're running a trade-in deal. If you bring in your first-party GC controller you can trade it in and get a Wavebird for $19.99. Pretty good deal if you've already got 4 GC controllers.

I've only got 3, so I'll be buying one and if I like it, I'll take one of my Cube controllers in to trade up for a second WB. Wireless will make multiplayer gaming so much easier.

-Kevin