Your search for "QSFP-40G-LR4" revealed the following:
Juniper JNP-QSFP-4X10GE-IR 40GB BASE-LR4 1310nm SMF QSFP+ Transceiver
SKU: NSB-5033
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 184.99
• 12 in stock
Call if you need more
Juniper JNP-QSFP-40GE-IR4 40GB BASE-LR4 1310nm SMF LC QSFP+ Transceiver
SKU: NSB-5034
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 69.99
• Only 2 remaining
Call if you need more
HPE JH232A 40GB BASE-LR4 LC SM QSFP+ Transceiver
SKU: NSH-4179
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 329.99
• Only 1 remaining
Call if you need more
HPE JG661A 40GB BASE-LR4 1310nm SMF LC QSFP+ Transceiver
SKU: NSB-5662
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 45.99
• 6 in stock
Call if you need more
Dell 407-BBGN 40GB BASE-LR4 1310nm SMF LC WRJMF QSFP+ Transceiver
SKU: NSB-8374
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 144.99
• 11 in stock
Call if you need more
NEW Dell 407-BBGN 40GB BASE-LR4 1310nm SMF LC WRJMF QSFP+ Transceiver
SKU: NSN-8406
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 155.99
• 11 in stock
Call if you need more
F5 F5-UPG-QSFP+LR4 40 BASE-LR4 1310nm 10km DOM LC/UPC SMF QSFP+ Transceiver
SKU: NSB-0873
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 166.99
• Only 2 remaining
Call if you need more
NEW Cisco Meraki MA-QSFP-40G-LR4 40GB BASE-LR4 1310nm SMF QSFP+ Transceiver
SKU: NSN-8323
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper EX-QSFP-40G-LR4 40GB BASE-LR4 1310nm SMF LC QSFP+ Transceiver
SKU: NSN-6367
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Juniper QFX-QSFP-40G-LR4 40GB BASE-LR4 1310nm SMF QSFP+ Transceiver
SKU: NSB-5039
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days