There are some available. For example: https://www.quectel.com/product/5g-redcap-rg255c-gl-m2/ - it costs around $120 per module. They have others: https://www.quectel.com/5g-iot-modules/
Which is pretty much what it costs for phone manufacturers right now.
I guess the real reason is that 4G is more than sufficient for pretty much anything, and it's going to be supported for the foreseeable future?
Where I live we are already talking about abandoning 2g, and 4g. (3g died a while back and 2g was kept as legacy network).
Really? Even satellites for off-grid messaging abandoned _5G_ and instead went with the good old LTE.