I have done this over and over... buy something at another retail store, then go to a Dollar store for something else and find that whatever it was that I bought was at a much better price there. What can I say? I'm a slow learner, I guess.
Anyway, don't do as I do, do as I say. Go to the Dollar store next time you need soap, light bulbs, seasonal or special day decorations, pencils, lampshades (Yes, I found one for a small lamp for a dollar!), snacks, canned food....
The reason Dollar stores are called Dollar stores is because they sell things for a dollar. Take a handful of dollar bills and take advantage of that!
Discovering the Dollar Store