Arduino Copter Cheap Version

Dear all, I want to ask you about the guidance on making a very compact and cheap Arduino copter.

I have a plan to buy this in near future (Radio Control Planes, Drones, Cars, FPV, Quadcopters and more - Hobbyking).

Can anybody here suggest what other components I should buy in order to make the copter works at minimum requirement?
Or anybody here has an alternative to build a cheap Arduino copter?

Thank you, I am looking toward your answer. :slight_smile: