Thank you for contacting the Intel Embedded Community.
Based on the ARK | Your Source for Intel® Product Specifications information the Expected Discontinuance Date of the cited device is Q1' 2022. You can confirm this information at the Intel® Ethernet Controller I210-IT Specifications web site.
By the way, please keep in mind that the availability of any Intel product depends on its demand on the market.
For more information and details, we suggest you to contact the Authorized dealer that better fit to your needs. The Authorized Distributors are listed at The Intel Global Distribution Network web site.
We hope that this information is useful to you.