I'M NOT SURE IF YOU ARE TALKING ABOUT THE TAIL MOTOR OR THE 3IN1 UNIT
BUT HELIDIRECT HAS ANYTHING YOU COULD WANT FOR THE CP.
OR JUST GOOGLE "BLADE CP PARTS" AND SHOP OR THE BEST PRICE, THEIR ARE A TON OF PLACE TO ORDER PARTS FROM. BUT FIRST I'D CHECK A LOCAL HOBBY SHOP TO SAVE THE COST OF SHIPPING AND WAITING FOR IT TO COME.
I BOUGHT MY CX FOR THE SAME COST AS THE CHEAPEST I FOUND ONLINE AT A LOCAL STORE AND DIDN'T HAVE TO PAY SHIPPING, I WAS FLYING BY DINNER TIME THE SAME NIGHT.