In the US, there are many chains of retail stores whose items are all priced at one dollar each. A generic and popular term for these types of stores is "dollar store". Geocachers often shop for trade items at such stores because of the low price and general randomness of goods available. They are also a good place to look for stuff for hiding a geocache. Dollar stores typically will have interesting containers, and they are also good spots to pick up a log book for your cache.