Amazon.com: 10Gb PCI-E NIC Network Card, Single Copper RJ45 Port, with Intel X540-BT1 Controller, PCI Express Ethernet LAN Adapter Support Windows Server/Windows/Linux/ESX, Compare to Intel X540-T1 : Electronics
Sonnet Solo 10G Thunderbolt 3 to 10 Gigabit Ethernet SOLO10G-TB3
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Amazon.com: 10Gb PCI-E NIC Network Card, Single SFP+ Port, with Intel 82599EN Controller, PCI Express Ethernet LAN Adapter Support Windows Server/Linux/VMware, Compare to Intel X520-DA1(Intel E10G42BTDA) : Electronics
The cheapest 10Gb Ethernet adapter has just landed | TechRadar