Where do you go to buy flavored syrups?

[elfs]

Okay, this is a stupid question, but I'm clueless. The grocery stores I visit have only a few flavors, the small trivialities used for coffee, like hazelnut and, if you're lucky, a mint or two. Where does one go to buy all of the other flavors of syrup, like watermelon and kiwi? I'd like to make Italian sodas this summer, and I'd like to know where I can find the smaller-sized bottles of more interesting flavors.