Do you use a laptop at office why?
So that you can take your laptop home and work on the same work that you did at work,
Belkin and Linksys make inexpensive routers for residential or small network use. You can pick them up at office or computer supply houses like Staples, Office Depot, Circuit City and others. For laptop use, your best bet would probably be to get a wireless router and a wireless network card for the laptop. This would allow you to use the laptop throughout your house or office without an ethernet cable.