$200 ODROID dual NIC H3/H3+ Intel Jasper Lake, https://ameridroid.com/products/odroid-h3
$400 HP T740 Ryzen Embedded thin client from eBay, add Intel PCIe quad port NIC, https://www.neelc.org/posts/hp-t740-freebsd/
$800 OPNsense Ryzen Embedded 10GbE router, https://wiki.junicast.de/en/junicast/review/opnsense_dec740