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IGN has revealed the list of Wii accessories that will be available for the Wii on launch day along with their prices in Japanese Yen, which should provide a rough guide for their prices when they are released over here.

1. Wii AC Adapter - 3,000 Yen (or about $25 USD)
2. Wii AV Cable - 1,000 Yen (or about $8.34 USD)
3. Wii S-Video Cable - 2,500 Yen (or about $20.86 USD)
4. Wii D-Cable - 2,500 Yen (or about $20.86 USD)
5. Wii Component Cable - 2,500 Yen (or about $20.86 USD)
6. SD Memory Card 512MB - 3,800 Yen (or about $31.72 USD)
7. Wii LAN Adapter - 2,800 Yen (or about $23.38 USD)

Source