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Many people seem to have a love-it-or-hate-it attitude toward warehouse stores, but I am a proud card-carrying Costco member because it does save me money. Here’s how I save money at Costco and avoid the (expensive) pitfall of overspending on bulk goods. With only two in our household, we don’t do all of our shopping at Costco, but some bargains keep us going back about once a month.