This Trendnet Wireless-G router is available for only $2.99 after a $40 rebate. IF the rebate works for you, it's a pretty darn cheap way to get your home network online and file sharing like the rest of us. At $2.99, it can work for a few months, die, and still be worth the price.
Update: Looks like this is Canada only. Thanks to Nicholass for writing in.
Trendnet 54Mbps Wireless-G Router (TEW-432BRP) [Future Shop - Thanks Mike!]