Your search for "QSFP28" revealed the following:
Arista QSFP-100G-DR 100GB BASE-DR 500m SMF QSFP28 Transceiver
SKU: NSB-5286
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Arista QSFP-100G-ERL4 100GBASE-ERL4 30-40km SMF Transceiver QSFP28
SKU: NSH-9088
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Dell S5248F-ON 48x 25GB SFP28 2x 200GB QSFP28-DD 4x QSFP28 F-B No OS10 Switch
SKU: NSB-9762
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Dell S5248F-ON-RA 48x 25GB SFP28 2x 200GB QSFP28-DD 4x QSFP28 B-F No OS10 Switch
SKU: NSB-9763
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
nVidia MFA1A00-E001 1m 100GB QSFP28 Active Optical Cable
SKU: NSB-4522
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Dell QSFP28-100G-LR4 GMFC5 100GB BASE-LR4 1310nm SMF LC QSFP28 Transceiver
SKU: NSN-2683
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco QSFP-100G-LR-S 100GB BASE-LR1 1310nm SMF 10km LC QSFP28 Transceiver
SKU: NSN-0030
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Extreme EC8404009-E6 VSP 8400 Series 8402CQ 2x 100GB QSFP28 Switch Module
SKU: NSN-8263
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Juniper QFX10000-30C-M QFX 10000 Series 30x 100GB QSFP28 MACsec Switch Line Card
SKU: NSH-9971
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper QFX5200-48Y-DC-AFI 48x 25GB SFP28 6x 100GB QSFP28 B-F Air DC Switch
SKU: NSN-3633
Condition: New
Shipping: Overnight Options
Warranty: 365 days