It's a toothpick drone with two 18650 batteries on it, I doubt it costs more than $100. There's video above of a hobbyist doing the same thing. I don't know how

It's a toothpick drone with two 18650 batteries on it, I doubt it costs more than $100. There's video above of a hobbyist doing the same thing. I don't know how autonomous this one is, but most quadcopters nowadays run STM32F4 processors, so, as you say, the software would be what's expensive.