you can google the restaurant, look up their menu--if you can find prices there. then you can calculate roughly if the shop will be a "loser" financially. For buffets, you can call the restaurant and ask the price of a buffet. As far as specifics about shops, often they are in the shopper guidelines. The email ad to get the shoppers to apply are usually less specific. I do all this quickly before I decide to take on a restaurant shop.
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Two wrongs don't make a right, but three lefts do.