Adorama offers the TP-LINK 5-Port Gigabit Ethernet Steel Cased Switch, model no. TL-SG105, for $10.99 with free shipping. That's the lowest total price we could find by $7, although we briefly saw it yesterday for $1 less via mail-in rebate. It features a metal case and purportedly saves up to 65% in power consumption.
Note that this item is currently backordered, but it can still be ordered at this price for delivery when available.