Yep, similarly. We work with PLCs where the manufacturer normally has fairly deep stocks of all the PLC CPUs, expansion cards, etc - guaranteed part availability is one of the big selling points of using PLCs. Some things are still available but others are completely out, to the point where we're considering completely redesigning some of our smaller experimental projects around e.g. Raspberry Pis.
What we do when RPis stop being available is yet to be seen...