Your search for "mms4x00-ns" revealed the following:
nVidia Mellanox MMS4X00-NS 800GB BASE 1310nm 100m DOM SMF OSFP Transceiver
SKU: NSB-4262
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 337.99
• 49 in stock
Call if you need more
NEW nVidia Mellanox MMS4X00-NS 800GB BASE 1310nm 100m DOM SMF OSFP Transceiver
SKU: NSN-1062
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 979.99
• Only 2 remaining
Call if you need more
nVidia MMS4X00-NS400 400GB BASE-DR4 1310nm 500m DOMSMF OSFP Transceiver
SKU: NSB-4631
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 582.99
• Only 2 remaining
Call if you need more