Their stock likely consists of what is delivered to them. Given the time of year, it's probable the item you were looking for was sold out locally. You can always check the website. It's a corporate store and inventory is not always a directly controlled item by people in that particular store.
A note to the person asking: typically customers answer in this forum not businesses.
I have never had a problem with stocking issues or bad service.
I have never had a problem either. I agree that it is most likely the time of the year.
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