Hi Icer,
I got my class 1 medical in Istanbul in Turkey for about 120 pounds. The best place to go is, the American Hospital in Istanbul. They will issue you with a JAA Class 1 Medical.
For training and licensing purposes, if you then need to convert it to a CAA class 1 medical, all you need to do is send the JAA certificate to the CAA in Gatwick, and they'll convert it for you for only 10 pounds.
Hope this helps!
James