Ultra 8-Port Unmanaged Ethernet Switch for $6 + free shipping
TigerDirect via eBay offers the Ultra 8-Port Unmanaged Ethernet Switch, model no. U12-42526, for $5.99 with free shipping. That's $14 off list and the best price we've seen for any Ethernet switch without rebate hassles. It features a plastic case and can handle 10/100Mbps network speeds.
4 very similar deals were also reported by some other sources: