Amazon offers its Prime members the D-Link 5-Port Gigabit Ethernet Desktop Switch, model no. DGS-1005G, for $17.99 with free shipping. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping costs $8.61.) That's the lowest total price we could find by $2, although we saw a refurbished unit for a buck less last winter. This 5-port desktop switch includes a power adapter, wall mount kit, and more.

Amazon Prime membership is $79 per year; however, Prime is free for college students for six months, and free for parents and caregivers for three months.