I agree to rapidrory on the motors and about the transmitter. Sometimes u can find deals where u get 2-3 servos with the transmitter / reciever combo and they might be hackable aswell.
Motors are more reliable than modifying the servos and at that cost its a great deal.
I've started ordering more and more stuff from china as most top rated sellers have free postage, it usually takes 4-7 days but can take 2-3 weeks if unlucky.
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