Adafruit sells ESP32 for less than $3. Any manufacturer can get quantity pricing to lower the cost. ESP32 doesn't have cell (AFAIK), but it wouldn't be technically that hard to add if they wanted. While $1 might be a bit on the low side, it is reasonable.
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Adafruit sells ESP32 for less than $3. Any manufacturer can get quantity pricing to lower the cost. ESP32 doesn't have cell (AFAIK), but it wouldn't be technically that hard to add if they wanted. While $1 might be a bit on the low side, it is reasonable.