Your search for "pwr-1900-dc-r" revealed the following:
NEW Arista HPE DCS-7260QX-64-R JH802A 64x 40GB QSFP+ 2x 10GB SFP+ B-F Air Switch
SKU: NSN-3586
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Arista DCS-7050TX2-128-F 96x 10GB Copper 8x 40GB QSFP+ F-B Airflow Switch
SKU: NSN-2526
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Arista HPE DCS-7260QX-64-F JH801A 64x 40GB QSFP+ 2x 10GB SFP+ F-B Air Switch
SKU: NSN-2411
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Arista DCS-7170-32CD-F 7170 Series 32x 100 Gigabit QSFP F-R Airflow Switch
SKU: NSH-8145
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Arista HPE DCS-7260CX-64-F JH799A 64x 100GB QSFP100 2x 10GB SFP+ F-B Switch
SKU: NSN-2400
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Arista HPE DCS-7260CX-64-R JH800A 64x 100GB QSFP100 2x 10GB SFP+ B-F Switch
SKU: NSN-2353
Condition: New
Shipping: Overnight Options
Warranty: 365 days