There is no such thing as a cheap car in Turkey, there are however a few fairly good outlets on the main road Toparlar to Koycegiz and again in Ortaca. Su automotive in Ortaca seem to have quite a few 2nd hand cars at the moment.
You could of course go to Izmir or Istanbul but the cost of doing so just to see as much rubbish as you will get around home seems pointless. Get the newest you can afford.
..i know of a 55 year old jeep for sale for around £3,000 and a fiat tofas about 30 years old for £4,000 .but thats what you will pay for 2nd hand cars here,i would take dalynsteves advice..go for a new one you can afford.also a lot less hassle than buying used..:42: