Most dollar stores require you to pay in the same form of currency that you are purchasing. For instance, four $1 bills can be purchased for $4, payable in 1-dollar bills. This has turned out to be confusing to some consumers, who wonder why they would bother going to the dollar store to purchase money if it costs them exactly the same amount of money to obtain the new bills ( which, very often, are old bills ). Fortunately for the dollar stores, they don't really rely on the custom of the average consumer.
Dollar stores are used extensively by the treasury arm of several national governments, though it is unclear precisely what purpose they serve. Spokespersons for the US Treasury Department have steadfastly refused to comment on the issue.