There are two completely fictional recurring locations in my nightmares that sometimes merge. One is a convenience store that shares its grounds with a multimedia type store (books, DVDs, music etc) while the other is a thrift type shop that usually attracts a very rough crowd of customers. Sometimes, these two concepts combine into one, or sometimes both will appear independently within the same dream.

I honestly don't know the origin as there is no real world analogue known to me for either, I think the big anxiety they latch onto is that of financial insecurity as I am often in these shops without the ability to pay for things that I really want, but in reality I love thrift shops and convenience stores, they are some of my favorite places where I buy the stuff most important or enjoyable to me.