I don't believe manufacturers are "rationing" units to keep prices high. The problem I see is manufacturers cannot get the parts they need to build enough to fill demand, especially since majors have sourced so many parts overseas in recent years due to "lower costs". They are now seeing just how "cheap" outsourcing is...

Ukraine has been a major source of wiring harnesses for farm and industrial equipment. Nothing moves without a wiring harness these days.  China has slowed shipping on everything.  It only takes one missing part to stop shipment of a large complex machine. Auto makers are having the same problems with popular models.

Take care of and keep your old units.