Turkish tourist offices stock OK- quality street maps of Adana, Ankara, Antalya , Istanbul and Izmir. The local privately would you stop street maps, Map Medya’s our best. it produces proper street maps of many Western Turkey cities (3 euro). You can pick these up in the good book shops along Istiklal Caddesi .
Turkish tourist offices stock every sheet tourist map (1: 850.000) - It is OK it's a pinch but it is usually out of date. The best sheet map of the whole country you can buy is the Türkiye Karayolları Haritası (1: 1.000.000; 3 euro), by Map Medya, updated twice a year.
For detailed touring, the Köy Köy Türkiye (Turkey Village by Village; 1: 400.000; 17 euro) atlas is the best. The Oto Atlas Türkiye (Road Atlas Turkey) 1:600.000 is another good option. You can buy these in Istanbul.