Heck, they still support the original Pis and A+; I just installed the latest version of Raspberry Pi OS on my A+ with 128 MB of RAM, and while it is slow, it works just the same.
The problem with the $ PiZero w/o WiFi or the $10 PiZero w/WiFi is you don't seem to be able to buy them in quantity. They are simply not 'available' to use in any sort of 'product', it seems.
