Hi, I know its a little late but maybe you're still in Turkey and would like to trade BTC for Turkish Lira. I'm not in Istanbul (in Izmir), but we can use Moneygram (
https://www.moneygram.com/MGI/EN/TR/Receive/Receive.htm?CC=TR&LC=EN) which I use frequently. It takes something around $15 fee for about $200. Or we can use PTT (Turkish Mail Service) which is way cheaper (6TL for 100-250 TL) but I'm not sure if its usable for foreigners.
Have a nice experience in Turkey ^_^