Used Cisco

1720/1721 Router – This has one 10/100 Fast Ethernet and two slots for WICs (WAN Interface Cards). These WICs can be several types of Serial and even ISDN or voice ports! This router runs standard IOS and has support for Inter-VLAN routing (1721 only), QOS, HSRP, and even VPN and firewall functionality. Expected cost $300 to $1000 used depending on configuration.