If I'm not mistaken they are based out of california and california is kinda dealing with some serious COVID related issues so they might be delayed on restocking.
ETM are Pennsylvania .... they have had factory staffing issues as I understand and some of their products have been unavailable. Best to contact them directly and inquire.
I doubt they're being discontinued. I got mine just a few months ago when they were updated with Mobius support. Had to wait several weeks for it to ship but it arrived eventually.