For Davis, the best grocery shopping experience is at the Nugget. Clean, well laid-out, welcoming, and beautifully displayed food, wine, and ingredients make the experience better than any other grocery in Davis (Albertsons, Safeway). The produce always looks great, the wine selection is good, they have a multitude of prepared foods to go if you're no in the mood for cooking, and best of all, the prices (particularly the items on sale) are suprisingly reasonable. The only things that could make it slightly better are a better international food/ingredient selection, and an expanded organic/natural food section.
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