After buying one of the bargain £50 PS2s from Tesco, I now have a Gamecube that'll no longer be used.
It's one of the Platinum (silver) coloured ones, and DOES have a digital out port. It's boxed complete woth RGB Scart lead, Power Supply and an official platinum controller.
GAMECUBE CONSOLE - £20.00
OFFICIAL PURPLE/CLEAR CONTROLLER - £9.00
OFFICIAL MEMORY CARD - £5.00
I know that some Gamestation's have pre-owned consoles for £12,99 (neither of my local one's do though) but I feel that this is a fair price (inclusing postage) for someone who can't get one locally.
All prices include Royal Mail 1st Class Recorded Delivery and presume payment via Bank Transfer. If paying via Paypal, fees of 3.4% + 20p will need to be added.