Wavebird prices have not dropped, given their easy compatibility with the Wii. I have noticed that some TRUs still have some stock -- that is where I bought my last two. The MadCatz wireless controllers are easy to find, but their overall quality does not match the Wavebird, but they still ain't that bad.
And Expane is right -- GCN game prices have not had a wholesale drop yet either. There have been isolated sales of certain titles, like Lego Star Wars, or Paper Mario, but by and large, no one but CC has been clearancing titles. Even on Ebay, there are no great bargains to be found on the more popular titles. There are still brand new Cubes selling for $100 in my nearby Targets and CCs.
The frustrating part for me, as a late comer to the GCN this past January, is that Nintendo does not make many efforts to keep all but a few Player's Choice titles available like many of the PS2 Greatest Hits titles are. Finding nice copies of games like Godzilla Destroy All Monsters Melee or DDR Mario Mix, while doable, can be a challenge. Also, given that Nintendo's product are considered "kid," what u often find in the used game stores is sometimes pretty ragged out.