Your search for "QSFP28-100G-LR4" 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
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Juniper JNP-QSFP-100G-LR4 100GB BASE-LR4 1310nm SMF QSFP28 Transceiver
SKU: NSH-5855
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 133.99
• Only 2 remaining
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Cisco QSFP-100G-LR4-S 100GB BASE-LR4 1330nm LC SMF QSFP28 Transceiver
SKU: NSH-5562
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 208.99
• Only 2 remaining
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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
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NEW Arista QSFP-100G-LRL4 100GB BASE-LRL4 1310nm Duplex SMF QSFP28 Transceiver
SKU: NSN-5904
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 375.99
• Only 2 remaining
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Arista QSFP-100G-LRL4 100GB BASE-LRL4 1310nm Duplex SMF QSFP28 Transceiver
SKU: NSB-5282
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 367.99
• Only 2 remaining
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Cisco QDD-2X100-LR4-S 200GB BASE-LR4 10km Dual Duplex CS SMF QSFP28 Transceiver
SKU: NSB-2436
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 2,299.99
• Only 2 remaining
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Finisar FTLC1151RDPL 100GB BASE-LR4 1310nm QSFP28 Transceiver
SKU: NSB-8740
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 132.99
• Only 2 remaining
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Arista QSFP-100G-FR 100GBASE-FR Single Lambda 1310nm 2km SMF QSFP28 Transceiver
SKU: NSB-5287
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 112.99
• 95 in stock
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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