Costco shoppers: Don't make these 7 costly mistakes

Costco saves its members a lot of money, but not everything at this warehouse club is a bargain. Several experts weigh in on common mistakes people make when shopping at Costco.

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Price mistake at my local Costco, in the system it was $4.50 off per pack, signage clearly said $4.50 off per pound. Manager came and honored the price, tried to argue but