In a form-factor I'm not familiar with (will they fit/be recognized in a non-HP motherboard?) but at this price I figured someone might benefit.
HP X540-T2 Intel Dual Port 10Gb-T Ethernet PCIe DL360 G9 Mezz Adpater 701525-00 887111290069 | eBay
$67.15 w/ free shipping & more than 10 in stock at time of posting
HP X540-T2 Intel Dual Port 10Gb-T Ethernet PCIe DL360 G9 Mezz Adpater 701525-00 887111290069 | eBay
$67.15 w/ free shipping & more than 10 in stock at time of posting