Hi,
Thank you for contacting Intel community.
EPCQL1024F24IN is obsolete.
https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/pcn/pdn1802.pdf
EP1S20F484I6N is obsolete:
https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/pcn/pdn1709.pdf
Stratix II and Stratix II GX status:
https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/pcn/pdn1709.pdf
Stratix and Stratix GX has been obsolete for few years. Stratix II and Stratix II GX will be obsolete in 2021 refer above PDN.
For other Stratix, they are still active and orderable. You can subscribe to our customer notification mailing list at below link so that you can be notified when an Altera(now Intel) device is going to be discontinued.
https://www.intel.com/content/www/us/en/programmable/support/support-resources/knowledge-base/solutions/rd04252012_977.html
Thanks.
Regards,
Aiman