Found a decent deal on eBay at http://www.ebay.com/itm/181176894912 - here's the listing info.:
New-in-box DrayTek Vigor 3900 (Vigor3900) Quad-WAN VPN firewall routerI tested the 3900 a year ago for an IPSec setup with lots of concurrent users - it's pretty solid. Not many routers have SFP fiber ports.
Load balancing, WAN failover, and bandwidth aggregation across 4+ different WANs/ISPs over Gigabit Ethernet ports, SFP fiber, and 3.5G cellular via USB dongle, perfect for business continuity and Dual-stack IPv4/IPv6 configuration with 802.1q VLAN tagging, up to 50 WAN/LAN IP subnets and QoS assurance and Web content filtering
Up to 500 simultaneous IPSec, PPTP, or L2TP VPN tunnels, with up to 200 SSL VPN Web-proxy tunnels
Includes Vigor 3900 unit, power cord, and manual