Your search for "ws-f6700-dfc3" revealed the following:
Cisco WS-F6700-DFC3C Distributed Forwarding Card
SKU: NSH-2307
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 159.99
• 7 in stock
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Cisco WS-F6700-DFC3A 6500 Series Distributed Forwarding Card (DFC3A) for CEF720
SKU: NSH-2306
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 64.99
• Only 2 remaining
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Cisco WS-X6748-GE-TX-3CXL 48x 1GB RJ45 Switch Line Card w/ WS-F6700-DFC3BXL
SKU: NSH-2478
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 184.99
• Only 2 remaining
Call if you need more