Your search for "qsfp28" revealed the following:
NEW Nvidia Mellanox MSB7800-ES2F 36x 100GB QSFP28 B-F Airflow (P2C) Switch
SKU: NSN-7914
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 6,785.99
• Only 1 remaining
Call if you need more
Extreme Brocade BR-SLX9850-100GX36CQ-M 36x 100G QSFP28 Router Line Card
SKU: NSB-5857
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 1,739.99
• Only 1 remaining
Call if you need more
NEW Cisco QSFP-100G-LR4-S 100GB BASE-LR4 1330nm LC SMF QSFP28 Transceiver
SKU: NSN-2310
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 444.99
• Only 2 remaining
Call if you need more
NEW HPE R3B01A SN3700M 32x 100GB QSFP28 Front-to-Back Airflow ONIE Switch
SKU: NSN-2790
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 3,289.99
• Only 1 remaining
Call if you need more
Arista DCS-7500RM-36CQ-LC 7500R Series 36x 100GB QSFP28 Switch Line Card
SKU: NSB-7181
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 2,869.99
• Only 2 remaining
Call if you need more
Arista CAB-Q-Q-100G-0.5 0.5m 100GB QSFP28 Direct Attach Copper Cable
SKU: NSB-5246
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 166.99
• Only 1 remaining
Call if you need more
NEW Cisco N3K-C31108PC-V 48x 10GB SFP+ 6x 100GB QSFP28 Front-to-Back Air Switch
SKU: NSN-8195
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 629.99
• 13 in stock
Call if you need more
NEW Arista CAB-Q-Q-100G-1M 1m 100GB QSFP28 Direct Attach Copper Cable
SKU: NSN-6736
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 119.99
• Only 1 remaining
Call if you need more
NEW nVidia Mellanox MCX456A-ECAT ConnectX-4 2x 100GB QSFP28 Interface Card
SKU: NSN-1092
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 436.99
• Only 1 remaining
Call if you need more
NEW Extreme 16790 X590-24X-1Q-2C 24x 10GB SFP+ 1x 40GB QSFP+ 2x QSFP28 Switch
SKU: NSN-4057
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 851.99
• 7 in stock
Call if you need more