https://www.ebay.com/sch/i.html?_nkw=Addon+E1G42Et+Ao+Addon+1Gbs+2X+Rj+45+Pcie+X4+Nic+F+Intel&_sacat=0&_dmd=2

Addon - E1G42Et-Ao - Addon 1Gbs 2X Rj-45 Pcie X4 Nic F/Intel

$159.00
$105.00

AddOn - Network adapter - PCI Express x4 - 1000Base-T x 2