Your search for "DCS-7800R3-48CQ-LC" revealed the following:
Arista DCS-7800R3-48CQ-LC 7800R3 48x 100 Gigabit QSFP Switch Line Card
SKU: NSH-9596
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Arista DCS-7800R3-48CQ-LC 7800R3 48x 100 Gigabit QSFP Switch Line Card
SKU: NSN-3716
Condition: New
Shipping: Overnight Options
Warranty: 365 days
Arista DCS-7800R3-48CQM-LC 48x 100GB QSFP28 w/ MACsec Router Line Card
SKU: NSB-0973
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days