For its "M" Club members only, mwave.com offers the TP-Link 5-Port Gigabit Ethernet Switch
, model no. TL-SG1005D, for $19.99
with free shipping
. ("M" Club membership is free; click here
to sign up.) That's the lowest total price we could find by $9, although it was $7 less in June (since expired). This "green" Ethernet port supports IEEE 802.3x flow control for full-duplex mode and backpressure for half-duplex mode.