Importing a Gamecube is cheap as hell. They can be found by the pile for 500 yen (minus hookups). I saw an auction on Yahoo Auctions last week for 10 loose Gamecubes with a starting bid of 1 yen and they didn't sell. Shipping wouldn't be expensive at all as it's so small and light.

Tomwaits is right, though - it's a super easy mod, as easy as it could ever get.