Your search for "MSB7890" revealed the following:
NEW Mellanox MSB7890-ES2F 36x 100GB QSFP28 Back-to-Front Airflow EDR Switch
SKU: NSN-9267
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 3,519.99
• Only 2 remaining
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Nvidia Mellanox MSB7890-ES2F 36x 100GB QSFP28 B-F Airflow (P2C) EDR Switch
SKU: NSB-6791
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 452.99
• Only 1 remaining
Call if you need more
Nvidia Mellanox MSB7890-ES2R 36x 100GB QSFP28 Front-to-Back (C2P) EDR Switch
SKU: NSB-6792
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days