Since official Nintendo component cables for the Wii are harder to find than Lindsay Lohan's dignity, here's a link to the MadCatz component cables. They should be just as good, and will run your $19.99. You do see a noticible difference when using component over composite, so Wii owners should definitely plunk down a Jackson for the quality upgrade.
Bonus: Pedro from Napoleon Dynamite and a director playing Wii Sports on the set of 24. That's awesome in so many ways.