Your search for "Juniper QSFP-40G" revealed the following:
HPE R0Y49A 6x 40G QSFP 48x 10G SFP+ Back to Front Airflow Switch Fabric Module
SKU: NSB-5625
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
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
Extreme EC7200A1F-E6 VSP 7254XSQ 48x 10G SFP+ 6x 40G QSFP+ F-B (AC) Switch
SKU: NSH-8294
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Arista DCS-7280QR-C36-F 24x 40G QSFP+ 12x 100G QSFP F-R Airflow Switch
SKU: NSN-2371
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Arista DCS-7280SE-64-R 48x 10GB SFP+ 4x 40GB QSFP+ Back-to-Front Air Switch
SKU: NSN-0084
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Arista DCS-7280QRA-C36S-R 24x 40GB QSFP+ 12x 100GB QSFP100 B-F Air Switch
SKU: NSN-2363
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW HPE Aruba JL625A 48x 25GB SFP28 8x 100GB QSFP28 Back-to-Front Airflow Switch
SKU: NSN-3640
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Extreme EC7200A3F-E6 VSP 7254XSQ 24x 10G SFP+ 4x 40G QSFP+ F-B (AC) Switch
SKU: NSN-5843
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Extreme 10319 40GB BASE-SR4 850nm MPO MMF QSFP+ Transceiver
SKU: NSN-5558
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Ruckus Brocade ICX7650-2X40GQ ICX 7650 2x 40GB QSFP+ Switch Module
SKU: NSB-6292
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days