TP-LINK Gigabit PCI Express Network Adapter TG-3468, for ESXi 5.5 home lab
Here's a quick look at the TP-LINK Gigabit PCI Express Network Adapter TG-3468, found on Amazon or Newegg for around $13 USD, with a nice product overview here.
Yeah, it's only one port. But it works right up through ESXi 5.1, out of the box. With 5.5, since it's based on a Realtek chipset, you'll need to manually add the right driver, which I detailed here, Install ESXi 5.5 with Realtek 8111/8168 NIC. While Realtek chipsets don't appear on the VMware Hardware Compatibility Guide, it's affordable, and works fine with ESXi.
Here's an Amazon buyer review by Reginald Francoi:
Buddy of mine recommended this NC. Works great on my ESXi 5.1 server and very inexpensive. I've purchased 2 and have had no issues what so every. Highly recommended.
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See also Think Before You Buy… PCI vs PCI-E Gigabit NICs by VMware's Brian Graf, Jun 6 2013.

Similar to what I did in Nov 2011 here, I'll be doing some casual speed tests of 3 NICs that span quite a spectrum of price points, to see if there's any significant different between them in the ESXi 5.5 home lab environment:
- High: Intel I350T2 Dual Port Ethernet Server Adapter, ~$135 on Amazon or Newegg.
- Mid: Realtek RTL8111E (built into my ASRock Z68 Professional Gen3 motherboard), cost of board when new in 2011 was $300 USD on Amazon or Newegg.
- Low: TP-LINK TG-3468 10/100/1000Mbps Gigabit PCI Express Network Adapter, $13 on Amazon or Newegg.
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These systems still work great for many even 9+ years later, mine included, even with (unsupported) vSphere 8 and Windows 11 Version 21H2. But unless you added the optional TPM module, it may be the end of the line as far as repurposing them for running the latest Windows 11 Version 24H2 and beyond.