Hi Manal,
I have recently been informed that searches need to be done through transplant centres, and they suggest that you have some sort of insurance it is a very expensive process. I don't know your current situation, but have you ever considered pre-implantation diagnosis with IVF - you can test for thalassemia and match for your child - then using the cord blood for transplant. Having a sibling match and cord blood gives your child the best chance. Of course this should only be considered in the context of you wanted to add to your family, and your personal situation - which you know best. Best of luck Manal.
By the way - i'm new on this site - nice to meet you!
Sharmin