Your search for "MCX516A-CDAT" revealed the following:
nVidia Mellanox MCX516A-CDAT ConnectX-5 2x 100GB QSFP28 PCIe Gen 4.0 x16 NIC
SKU: NSB-1474
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 489.99
• 49 in stock
Call if you need more
NEW nVidia Mellanox MCX516A-CDAT ConnectX-5 2x 100GB QSFP28 PCIe Gen 4.0 x16 NIC
SKU: NSN-1078
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 734.99
• 49 in stock
Call if you need more