For Prime members only, Amazon offers the Dell SonicWall TZ400 Network Firewall for $602.65 with free shipping. Outside of the seller below, that's the lowest price we could find by $106. It features 1.3Gb/s firewall throughput, seven Gigabit Ethernet ports (one input, six outputs), USB 3.0, DoS attack prevention, and VPN, VoIP, PAT, and VLAN support.

Don't have Prime? Dell Small Business offers it bundled with a $50 Dell Gift Card for $709 with free shipping. Deal ends October 9.