What are the best foods in italy mainly

It depends on the region....and your taste.  My favorite pizza might not be your favorite pizza.  I prefer "bianco" with no sauce...but that is me.  And the same goes for gelato (not ice cream).  The flavors I like and which I think are good might not appeal to you.  Tell us what region/s you will be traveling to and we can suggest foods that are typical of that are.  The cuisine of Italy is very regional...and often even very diverse within a region.  

Is it possible to find exclusive and rare Italian or French delicacies that are usually not available in local stores through online purchasing?

Sicily > https://www.orangemoon.it/it/