Quad 250 Mini Quaad

You can just order another one of those ESC's as long as it's exactly the same. Just remember to go through the setup again though and calibrate it. But, You could order 4 more to have them all the same from teh same batch number, and that would give you 3 extras.
 
I wouldn't run anything less than 12 on those motors, preferably 15a. Just in case you start flying "spirited".
 
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