How much does this cost to the nearest dollar?

Sonnet Twin 10G SFP+ Thunderbolt 3 to Dual 10 Gigabit Ethernet Adapter (SFP+s Sold Separately)
Adds High-Performance 10GbE SFP+ Connectivity—Simply powerful way to add dual 10GbE SFP+ connections to your computer with Thunderbolt 3 ports Connection Flexibility—Choose between two short-range or two long-range SFP+ transceivers plus LC fiber optical cables (all sold separately), or two SFP+ direct-attach Twinax copper cables (sold separately) to connect the adapter to your network or storage Supports Transparent Failover—Keeps your computer connected in case a single cable is disconnected or one of the ports fails Two Thunderbolt 3 Ports—One port reserved for connection to the computer; second port

Price is $650.00

Price: $649.99