I suggest to go to latest version than EoL, if possible you contact local sales and replace with new one, by paying difference values.
Product Migration Options
Prime Infrastructure 3.5 will be the last version to support Prime Infrastructure Data Center. The migration path for customers is to use DCNM for NXOS deployments and ACI for ACI-mode Deployments on data-center devices.
Service prices for Cisco products are subject to change after the product End-of-Sale date.
The Cisco Takeback and Recycle program helps businesses properly dispose of surplus products that have reached their end of useful life. The program is open to all business users of Cisco equipment and its associated brands and subsidiaries. For more information, go to: https://www.cisco.com/web/about/ac227/ac228/ac231/about_cisco_takeback_recycling.html.