Tricopter servo

First off, thanks to David for his effort in showing us how build an inexpensive multirotor. I bought all the parts from hobbyking, had great fun building it, and it flew beautifully first time.

Now to my question. The suggested Blue Bird servo burnt out after a crash and I cannot find a replacement here in South Africa, and Hobbyking is out of stock as well. Any suggestions on a different servo?