Oh my god, the Gamecube Broadband Adapter has to be rare again.
Just go to ebay and Search "Gamecube Broadband", some people are bidding over 50$ and theres a few buy it nows for 70$!
I was lucky in Feb. When i got mine brand new for 35$.
I've also gotten reports from people at IGN that its gone as high as 90$ there.
Amazing what people will do for their PSO gaming fix.