The ODROID H3+ seems to be a good deal with this CPU atm. It's $165 barebone (no ram, storage, case, or power supply). You can also buy their M.2 H3 Netcard to add 4 additional 2.5GbE for $47 for a total of 6 2.5GbE. But they are Realtek NICs though so probably better to virtualize for firewall installs.