I always get a good rate from the change office in Fethiye, no idea what it's called, but it's just around the corner from the bank street and they have the rate on display. They don't charge commission so what you see is what you get. If I can't get into Fethiye then I go to the guy on the seafront. I've forgoten his name, but he works out of the gift shop before you get to the twins place. If you use him a few times he will remember you and give you a better rate than the one on the board.