The Tiny form factor that built a thousand Proxmox clusters. A 35 watt T-series eighth generation Core processor, room for 64GB of memory, and a PCIe riser that accepts a low profile card, which is how people add 10GbE. Roughly a liter in volume, idles near 8 watts, and is effectively silent.
Across 97 listings tracked in the last three days, the median total cost in USD including shipping is $176, and the lowest is $75. RackSniper flags a listing once it falls at or below 70 percent of the trailing 30 day median, which for this product means roughly $123 or less. Condition and configuration vary widely on used enterprise hardware, so treat the median as a reference point rather than a target.