A Donut shop that closes it doors when it sells out!

If you genuinely adore doughnuts like I do, then a trip to The Vault is a  must-do on your Chicago list.
Situated in the Windy City’s River North neighborhood, The Doughnut Vault opens at 8:30 am each day from Tuesday through Friday and 9:30 am on Saturday mornings. Patrons are given good incentive to get there promptly, The blue doors slam shut just as soon as the last ring is sold, which is usually an hour or two after opening.  Forget your visa card, this shop only accepts cash.  Some 600 pastries are reportedly sold by The Doughnut Vault each day.
Doughnuts are easy to find in your average North American city — what better way to set yourself apart than by making sure yours aren’t? A get-it-while-its-hot model to emulate in the category of your choice?