Went to my Target today and happened to be looking in the clearance section and found the Gamecube Broadband adapter for $8.75. It's probably a YMMV but I found it at the Target in Atlanta, Georgia near Lenox Mall.
I went to Circuit City for $75. But I remember someone mentioning that they found it for $40 at Target. Are there any other stores or stores online that sell the HDD drive for $50 or less?