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volume retailer; mass marketer; emporium
量販店で家電を安く買えた。
I got appliances cheap at a big-box store.
駅前に新しい量販店がオープンした。
A new big-box store opened in front of the station.
量販店と個人商店では品揃えがまるで違う。
The selection at big-box stores and small shops is totally different.