Your search for "juniper qsfp-40g" revealed the following:
NEW Arista DCS-7300X-32Q-LC 7300X Series 32x 40GB QSFP+ Switch Line Card
SKU: NSN-2181
Condition: New
Shipping: Overnight Options
Warranty: 365 days
HPE JH359A FlexFabric 12900E Series 48x 40GB QSFP+ Switch Line Card
SKU: NSB-8339
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
SuperMicro CBL-NTWK-0325-02 2m 40GB QSFP+ Direct Attach Copper Cable
SKU: NSB-7321
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Ruckus ICX7550-48 ICX 7550 Series 48x 1GB RJ45 2x 40GB QSFP+ Switch
SKU: NSB-7414
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Arista QSFP-100G-CWDM4 100GB BASE-CWDM4 SMF Optical QSFP28 Transceiver
SKU: NSN-5677
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Extreme EC7200A1B-E6 VSP 7254XSQ 48x 10G SFP+ 6x 40G QSFP+ B-F (AC) Switch
SKU: NSN-5050
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco C9500-32QC-A Catalyst 9500 32x 40GB QSFP+ Switch
SKU: NSN-4268
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Arista DCS-7500RA-36Q-LC 7500R Series 36x 40GB QSFP+ Switch Line Card
SKU: NSN-9206
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Extreme EC720001F-E6 VSP 7254XSQ 48x 10G SFP+ 6x 40G QSFP+ F-B Air (DC) Switch
SKU: NSH-9345
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Osi QFX-SFP-1GE-LX-OSI 1GB BASE-LXD SMF 1310nm Juniper Comp SFP Transceiver
SKU: NSB-1128
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days