A shuarma it's pretty cheap, it goes for less than 2 dinars and it comes with french fries and several bacteria. Just kidding, but I was told not to eat those, lately even the ministry of health is investigating how safe is this kind of food. I have been lucky so far though.
A decent meal in a clean western standard restaurant goes for about 15-20 dinars, but if you like pizza you can get a pizza dinner with about 7-8 dinars.
I have to say it's a pretty good pizza too.