Dorra very kindly put up the web address on another site, and I've printed off the limitations they state. To save you looking it up, for entry into Tunisia it gives:
Tobacco: 400 cigarettes or 100 cigars or 500g tobacco
Liquor: 1 litre of spirits or 2 litres of alcoholic beverage
Perfume: 250ml of perfume; 1 litre of eau de toilette
Gifts: Duty free allowance up to TD 100
Cameras: 1 still camera (which seems very odd indeed)
Currency: Import/export of local currency prohibited