- Tips for getting cheap used x86-based firewall with full Gbit NAT (a PC Engines APU) if you are in the US
- QNAP QHora-301W
- plenty of mini-PCs on Bezo's bookstore or Jack Ma's marketplaces with 4-6 ethernet ports and up to (at least) 2.5GBASE-T
- Mikrotik offers the RB5009UG+S+IN
- Solidrun has a couple of clearfog or machiatobin devices
- Deciso has DEC740/ DEC840/ DEC850 to offer
- …
Plenty of options that just work™, now (or close to).