2 of 2 people found this helpful
I don't know where you are located, but I assume ebay could work for you. I've noticed some sellers have the bare sensor without the board. I assume most/all are from China.
that one has a variety of MQ-x sensors.
This one is specifically has the MQ-2:
I have NOT bought from these vendors, so I'm not endorsing them. I'm just saying that there are several sellers on ebay you could try.
3 of 3 people found this helpful
These types of sensor can wear out, so it might be better to install a socket:
Note that the socket has a different footprint than the sensor.
Also note that some MQ sensors have different pin diameters even though the pitch is the same.
I put both socket and sensor footprints on the PCB.