But, if you unpack the FTL file and edit data\blueprints.xml.append, find this line:
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<sensors power="1" room="3" start="false" img="room_sensors_2.wc____">
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<sensors power="1" room="3" start="true" img="room_sensors_2.wc____">
I'm not sure if you can have it to start AND have power 0. It may cause issues. But starting with 1 will (obviously) be no problem.
I don't know why they're so rare for you. I know I've bought it before (I like having scanners) but I've not played the new version much except to make sure it doesn't crash. I'm still in the stock-ships-only phase of AE for my own personal play.