So where do you get a Wii? You can try the normal brick and mortar stores or go online. Ebay is an obvious candidate, but I also recommend Play-Asia as well. It's the site where I often purchase my Nintendo DS games.
The Nintendo Wii (which includes Wii Sports) is going for USD 399 at Play-Asia, not inclusive of the shipping fee (click here for details). But regardless of whether you are buying from PA or Ebay, be sure to get the Wii early to avoid disappointment from the lack of stock, or delays in shipping.