I have an official component cable for the Gamecube up for auction. Three-day auction with about 2.5 days to go. Currently at $20 with one bid and no reserve with free shipping!
http://www.ebay.com/itm/Official-Gamecube-Component-HDTV-Cable-w-FREE-SHIPPING-NR-BIN-/170895974032
http://www.ebay.com/itm/Official-Gamecube-Component-HDTV-Cable-w-FREE-SHIPPING-NR-BIN-/170895974032