@Ivet Oh, that's funny. I apparently never look beyond the front door of the grocery store. I have no memory of stands to return carts in the middle of parking lots in Bulgaria. I'll have to keep my eyes open for them when I am back in BG. 

As for the quality of food, I think it really depends on where you're buying it. I should probably write a whole post on this. The basics are this: I think that locally grown food is just as good as locally grown food in Bulgaria. When it comes to comparing supermarkets I think it's a different story.