A dual port 10GbE SFP+ card built on the Intel 82599 controller. Driver support is universal across Linux, Windows, VMware and BSD, which is why it remains the default recommendation for adding 10GbE to a homelab despite being an older design.
Across 101 listings tracked in the last three days, the median total cost in USD including shipping is $25, and the lowest is $15. RackSniper flags a listing once it falls at or below 70 percent of the trailing 30 day median, which for this product means roughly $18 or less. Condition and configuration vary widely on used enterprise hardware, so treat the median as a reference point rather than a target.