Val,
We use Innan (not sure spelt right)at Aygaz on the main Gunlukbasi road.
They will bring the first bottle complete with pipe and install for you. I believe the cost was approx 45 YTL, refills are 25YTL. We ran out one night whilst cooking sent him a text and 5 mins later he was at the door, amazing service considering we didn't give him an address. I can supply you with his number if you require or its a 5/10 minute walk from your house.
Gary