The menu offered a Gourmet Chicken Wing Dinner: 20 wings and a bottle of Dom Perignon.

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When Rolland visits, the two carouse long into the night, drinking Dom Perignon, 1982 Bordeaux and Grand Marnier.

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The burger comes with a bottle of Dom Perignon to wash it down.

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"I still get to buy caviar and drink Dom Perignon, " she shrugs.

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Besides this, Costco brings in high end products such as Coach purses and Dom Perignon champagne from time to time, which keeps buyers interested.

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Any decent wine steps it up a notch in these unusual sizes, which are also common for better champagnes, like Dom Perignon, widely available in magnums.

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And apparently luxury shoppers are following this philosophy, as the French luxury conglomerate, LVMH (who own the likes of such brands as Louis Vuitton, Dom Perignon, and Christian Dior), reported a 15% gain in 3Q sales.

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