I could build an entire Minne unit including batteries, harness, and cage for about $3000 and about $1000 of it would be in the batteries. The problem I have is that it is built with the lowest quality and cheapest components you can find out of China and so many corners have been cut to reduce cost and development time. Also for only about $2000 more you could get an SP140 which will last literally ten times longer with far better power, flight times, and way better safety. Or for about the same price you could go buy an X4 with comparable flight times, but with more thrust, zero torque, much better safety, and it would last many times longer.
I did go through in a previous thread and compare the specs of the X4 to the Minnie and it wasn´t pretty. I do respect the guy who developed the Minne as he did get it in the air and he has managed to make a living out of it, but the quality to cost ratio and the frankly dangerous design of the Minne drives me nuts which is why I highly recommend getting a different unit.