Your search for "qsfp28" revealed the following:
Arista QSFP-100G-LR4 100GB BASE-LR4 1310nm Long Reach SMF LC QSFP28 Transceiver
SKU: NSB-5280
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 262.99
• 29 in stock
Call if you need more
NEW Cisco C9300X-NM-4C Catalyst 9300X 4x 100GB QSFP28 Switch Module
SKU: NSN-4850
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 3,565.99
• Only 2 remaining
Call if you need more
Cisco N9K-C9236C 36x 100GB QSFP28 Front-to-Back Airflow Switch
SKU: NSB-6908
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 759.99
• Only 2 remaining
Call if you need more
NEW Cisco C9300X-NM-2C Catalyst 9300X Series 2x 100 Gigabit QSFP28 Switch Module
SKU: NSN-4324
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 1,101.99
• 18 in stock
Call if you need more
Cisco N9K-X9736C-FX Nexus 9500 36x 100GB QSFP28 Switch Line Card
SKU: NSH-7713
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 521.99
• Only 2 remaining
Call if you need more
NEW Arista CAB-Q-4S-100G-2M 2m 100GB QSFP28 to 4x 25GB SFP28 DA Breakout Cable
SKU: NSN-7110
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 49.99
• Only 2 remaining
Call if you need more
Cisco N9K-C93240YC-FX2 48x 25GB SFP 12x 100GB QSFP28 Back-to-Front Air Switch
SKU: NSH-8937
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 1,719.99
• 10 in stock
Call if you need more
NEW Arista AOC-Q-Q-100G-7M 7m 100GB QSFP28 Active Optical Cable
SKU: NSN-5332
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 169.99
• 5 in stock
Call if you need more
Cisco N9K-C9364C Nexus 9000 64x 100GB QSFP28 2x 10GB SFP+ F-B Air Switch
SKU: NSB-7432
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 3,162.99
• Only 2 remaining
Call if you need more
NEW Cisco N9K-X9432C-S Nexus 9500 Series 32x 100GB QSFP28 Switch Line Card
SKU: NSN-0639
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 979.99
• Only 1 remaining
Call if you need more