Start with the Core firewall, then add only the modules you need. The more you pick, the less each one costs. The Full Suite includes everything.
The complete firewall: rules, NAT, routing, VPN-provider routing, DHCP, DNS, updates, backups, console.
$129 / year per firewall
Add exactly what you need. Each module costs less the more you pick:
The Core plus every module, including new ones released during your term.
$299 / year per firewall