Do you know there is brusless motor inside every digital clock which gives the rotation pulse to the clocks second hand movement and further to the all the moving parts inside. smaller the clock smaller is the inrunner magnet. if you recover a inrunner magnet from the cheap china made digital clocks, you can actually fabricate a small micro brushless motor similar to the onle listed last in the brushless motor catagory of the http://microflierradio.com/motors.html for $ 120 which does not need a ESC also. At the miniscule current requirement for it to run, it will run on the signal pulse of the receiver also.

But for the thrust it generates to match it with the correct receiver of appropriate wt is the trick ( fabricating one is one still i am not confident) to flying such micro models at a DIY cheaper option.