Potbelly may make a tasty sandwich -- in fact, they make several -- but the company has done almost nothing but give investors indigestion since its blockbuster opening day from its 2013 IPO. Now, its forecast is sure to have stockholders reaching for antacids. And Family Dollar is being threatened by Carl Icahn, but the company will have one more chance to report a solid quarter, or else shareholders may start thinking it is time for change. Finally, Jim Cramer's going with Costco, and so is Apple: Cramer is targeting $124 a share for the mega retailer, and likes the move to carry Apple products.

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