Ask that question i should explain what is this customer demand?
He need a DSLR microphone work with camera and pc within 100 range and no require for the battery.
But I should say actually all the microphone will be need battery,just no need extra battery like li-battery,AA battery or button battery.when you mini shotgun microphone lensgodmm1 dmm2 plug into the PC become a PC Mic input to provide “plug in power” of 2-3V which is enough to operate a condenser mic which needs only that much voltage.
Get this then you will have a lot of choice for the camera and pc within 100 usd.