This story was originally published on C-Store Dive. To receive daily news and insights, subscribe to our free daily C-Store Dive newsletter. Dive Brief: RaceTrac has agreed to buy Potbelly Corporation for $17.12 per share, or about$566 million, Potbelly announced on its website Wednesday. The all-cash deal for the sandwich shop, which has about 445 locations across the U.S., is expected to close in the fourth quarter. This news comes a little more than two years after RaceTrac agreed to buy energy co ...