3.3v Gas Sensors?

Hi! Been having a lot of difficulty in finding sensors that run at 3.3v for gas sensing. I've seen quite a few that run at 5v, but I'm using Arduino on an ESP module. There are a few providers that I have seen from China but I don't see any easy way to obtain the sensors. One I found was the ELT S-300-3V.

I was hoping people here might know where to get relatively cheap but reliable 3.3v gas sensors.

The MQxx-series are inexpensive, but require more 'puff'. A cell-phone-charger? This family of sensors isn't ideal for long term battery operation : (up to 200mA)

My goal is to have this running long term off battery.

No chance of that. The heater requires considerable power.