Your search for "MCX455A-ECAT" revealed the following:
NEW nVidia Mellanox MCX455A-ECAT 1x 100GB QSFP28 PCIe Gen 3.0 x16 NIC
SKU: NSN-1167
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 292.99
• Only 2 remaining
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nVidia Mellanox MCX455A-ECAT 1x 100GB QSFP28 PCIe Gen 3.0 x16 NIC
SKU: NSB-8601
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 179.99
• Only 2 remaining
Call if you need more