We bought ours from the yard on the left as you go out of Gunlukbasi towards the main road to Dalaman, it's next to one of the 'Beton', (concrete) companies yards. Just don't ask for 'Cakal', as it is only meant for concrete ballast!! You just cannot beat 'Hard Landscaping'!!
We had about 10 tonnes delivered for aprox. 300 Ytl, but that was a few years ago!! Barter,barter, barter.

Gordy.
P.S. By the way, 1 cubic metre is aproximate to 1 tonne.