Black Box LGB304A 4-Port Gigabit Unmanaged Switch LGB304A B&H
Pciex4 4 Ports Gigabit Ethernet Lan Card 1000mbps Nic Realtek Rtl8111h Chips Designed For Small Cases Of Lenovo M720q M920x P330 - Network Cards - AliExpress
StarTech.com 4 Port PCIe Network Card - Standard Profile NIC - RJ45 Port - ST1000SPEX43 - Ethernet Adapters - CDW.com
4-port PoE Gigabit Ethernet Switch - Dahua Technology USA Inc
24-Port Managed Gigabit Ethernet Switch | Linksys | Linksys: US