D-Link 5-Port 10/100/1000Mbps Gigabit Switch for $14.99 shipped after a $10 rebate. Note that this is a Gigabit Ethernet switch that goes up to 1000Mbps and not the typical 100Mbps switch. It is also supposedly optimized for lower energy consupmtion. Most places usually have this Gigabit switch about $34. Note that a standard D-Link 100Mbps Switch is also available for $8.99 shipped after a $10 rebate. However, getting a Gigabit Ethernet Switch for slightly more may help not just to expand existing network but also better ensure future network upgradability.
Originally posted earlier, this is just a friendly reminder.