This support statement is provided by the Product Management Team. 

McAfee announces the End of Sale for McAfee Network Security Network Threat Behavior Analysis Appliances. The End of Sale date was March 31, 2018.
As of this date, these appliances were no longer available for purchase. 

NTBA appliances will reach End of Life and End of Support on April 1, 2023. Existing NTBA Appliance customers receive support until that date, in accordance with the Enterprise Products End of Life Policy.

We recommend customers use the Virtual NTBA solution.

For more information about all SKUs that reached End of Sale, see the McAfee Product & Technology Support Lifecycle page.