Incase you don't know what it looks like when you shop for it. They are other Wi-Fi connectors, such as for laptops, so be specific when you ask a sells man for it. Also compare prices before purchasing it, the best way is to call the store for the price, instead of running all over town. This website here will answer any questions you have for it.
http://www.nintendowifi.com/customersupport/SupportHome.jsp
