I’m thinking about buying a mod for the Gamecube, to play backups and imports. I would require a chip, namely the Duo Q ($15.49). Then I could either buy mini DVD-Rs for over $1 each, or use regular DVDs with a replacement case for for $19.99, and the DVD-R’s are about $0.10 each.

It seems like the best deal is the chip and the replacement case, and $35 (before shipping) is not bad for a modded system.