David - are you still living here 'cos if you are you are paying way too much. I have lived here now for more years than I will divulge and this is my advice:
Personal items: you can buy big name brands of shampoo, conditioner and hair care products cheaply. e.g. Shwarzkopf shampoo is less than tnd6.000 a bottle. This translates to around PS2.000. Hair colour is also a lot less here and also big name brands. Deodorant is readily available as are shower gel etc etc. Toothpaste such as Sensodyne/Colgate etc much cheaper here. However, bars of soap are small and while cheap for expat with foreign exchange they are expensive for those of us who live here full time.
Alcohol: The cost of alcohol has been reduced by around 50% and in Geant eg you can buy good bottles of French wine etc for under tnd20.000. The local beer is around 1.000 a can and is not too bad.
Household goods: We have top name brands that are reliable, come with guarantees and are much cheaper than the west. You can buy cheaply during the many promotions. Samsung, miele, LG, westinghouse, etc etc. TV is much cheaper here for plasma etc.
Household items: I recommend that if you like good quality sheets and towels you bring them with you. This is the one thing we don't have. Also bring doonas and covers we don't really have them here. Also if you prefer blankets then bring them with you, here they are nylon and nasty!
Food: Don't buy your food in the supermarkets - go to the souqs. You will find good quality and very fresh at the cheapest prices. You can also afford to eat all the things considered 'luxury' in the west. Artichokes eg right now are 800millimes for a bunch of 3!! Pomegranites in season, oranges, pears. The only thing not good this year was the apples as bad hail storms hit the apple growing areas. Bananas are imported and tend to be expensive. Right now they are around Tnd3.000 kilo.
Pharmacy: Medication is much, much cheaper here. You can confidently buy your medicines here for a fraction of the price in the west. Foreigners generally can buy without a prescription. Just take the packet into the pharmacy and they will provide it to you. However, I do find that the painkillers/cold and flu stuff is not great here so I tend to stock up whenever I go to the UK or back to Aus.
Make-up, skin care: Great products available here from France and much cheaper than I ever found in the west. Perfume also as everybody is addicted to smelling nice!
Eating out: You can eat out very cheaply here. Great pizzas for under tnd3.000, lablabi for nothing, cascroutes (sandwiches) made with 1/2 baguettes and filled to the brim. Restaurants can cost from as little as as you want to as much as you want. French restaurants can be pricey but so much cheaper than back in the west and yay not a Maccas in sight!!
As for the comments about ISIS - I am the 'only blonde in the village' and I am so not worried. We have a great defence force and the Tunisian is a fierce and courageous warrior when the country is under any sort of 'attack'. You only have to look at the revolution to know how great we are and how great is our army!
So, if you are thinking of coming to Tunisia you are welcome and you will fall in love with it and like the 'lotus eaters' you will want to stay