Hi,
I've found that most hotels I've stayed in in Tunisia include dates in the breakfast buffet. Also, as you love dates you might like the local date liqueur Thibarine. It'll certainly be cheaper than imported liqueurs. Though, in common with Aslemma, my favourite is Cedratine.
As for price rises, I was in Hammamet at the beginning of July and didn't find it to be noticeably more expensive than my last trip which was early last year. I did find the cost of (alcoholic) drinks and to some extent the food at the hotel more expensive, but just assumed that this was hotel pricing. I've usually found prices to vary quite a bit from one hotel to another. Outside the hotel, prices seemed to be pretty much what I was used to.
A.