I'd like to know if there is an existing offer for Extended support for CA Single Sign-On 12.52SP1?
Here's the announcement for 12.52 (including SP)
CA Single Sign-On r12.52 End of Service Announcement
CA Extended Support, a CA Technologies support offering, that extends support for CA Technologies software product versions or releases that have reached End of Service. CA Extended Support will be available until February 28,2020. Please note, however, that in most cases CA upgrade services will provide a more cost-effective and valued approach than CA Extended Support alone.
Further reading :
CA Single Sign-On (formerly CA SiteMinder) Release and Support Lifecycle Dates
CA Extended Support