I am considering this business idea. there are a lot of events in which the people can not or don't like alcohol beverages; but want something attractive and different.  They are sick and tired of the coffee and milk thermos for their activities.  so I want to offer a specialty coffee cup and granito beverage,since I am in an island where hot is in the air. Do you have any formula of what can I charge for the service that include:espresso coffee machines, grinders, coffee beans, etc.  I know that every market is different. but Costco, Sams, kmart, etc. are chains which sales in our island exceed the sales of international chains.  Your advice will highly appreciated!!!!