Italian Ice Machines are very expensive. They range anywhere from $1,200 for smaller ones that produce only a quart or two of ice cream, to machines that cost over $12,000 for top of the line, big ones that produce more ice cream. However if you want a cheaper machine,go for a used one, or a refurb.
Depends on how you define 'expensive'. Like anything else, the more you're willing to spend may buy you increased quality. I know some are sold for $30-50 and are quite good (I prefer one of Hamilton Beach's models) but in my experience, a blend will work just as well and you're likely to have one.