newegg.com also tends to have good deals on this sort of thing. You can also hook one computer (or whatever) to a wireless router with a cable. So, you could have your computer on a wireless connection, a Wii on a wireless connection, and the XBox on a wired connection, since the XBox wireless adapter is about $80. Wireless net cards for standard computers are a lot cheaper than that, but if your computer is new enough to have Vista, it's likely enough to already have a wireless adapter in it.