(gasp) well that really stinks because I am on my last hundred or two. Nice that Mouser has two whole bags on order. I usually buy two whole bags myself! That's really going to put an end to HeaterMeters until I find a new part and redesign the PCB (and all my existing PCBs will be garbage).
Everything is becoming harder to find and I hear that it is going to get a lot worse before it starts getting better... in 2022.