Your search for "DWDM-SFP10G-C" revealed the following:
Cisco DWDM-SFP10G-C-S 10GB 1529~1561nm 80km DOM SMF SFP+ Transceiver
SKU: NSB-2781
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 1,425.99
• 4 in stock
Call if you need more
Cisco DWDM-SFP10G-C 10GB 1529.16~1567.13nm 80km DOM SMF SFP+ Transceiver
SKU: NSB-2743
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 239.99
• Only 2 remaining
Call if you need more