Your search for "QSFP-40G-ESR4" revealed the following:

Juniper QFX-QSFP-40G-ESR4 40GB BASE-ESR4 850nm MMF QSFP+ Transceiver

SKU: NSH-9694
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

$ 105.99



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Dell QSFP-40G-ESR4 40GB BASE-ESR4 Extended Short Reach MMF QSFP+ Transceiver

SKU: NSB-5938
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days

NEW Juniper QFX-QSFP-40G-ESR4 40GB BASE-ESR4 850nm MMF QSFP+ Transceiver

SKU: NSN-3404
Condition: New
Shipping: Overnight Options
Warranty: 365 days