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The "problem" with that is that typically an item that a business will happily pay $200 for can only be sold to a home customer for $10. Selling consumer items is a good example of things that require scale.

I've been happy with our "North Flower Care" BLE plant monitor. Monitors light (which is not useful IMO for an indoor plant), moisture, temperature, and soil fertility. There's a companion app that can record the data and correlate it with what the plant you've configured finds ideal.

I paid $11 for it, which is a lot more reasonable than the current $30, but if it helps a plant you like grow... I don't actively monitor it with an automation, but I recall poking at it with one of the NRF apps and seem to recall that the data format was open enough that you could monitor it outside the official app.

Xiami Flora should be good enough and widely supported (Home Assistant and similar). Sends simple BLE packets.

Ecowitt sensors are well done in my experience and they have a soil sensor product. Works with HomeAssistant too.