There are tons of differences between prosciutto and normal American deli hams. Prosciutto is made from smoking, drying, and curing the ham in it's whole state usually over the course of several years. Your average deli ham is processed and directly packaged for resale. You may find these too sweet because the majority of the time there is both water and sugar added. Prosciutto is more expensive simply because it is more expensive and time consuming to make, also there is a much smaller market for it over your generic deli hams. There is no layer of fat because it's processed in directly to the meat.
