In 2009, Dollar Tree redesigned their website with a new e-commerce platform.

Dollar Tree also recently added customer ratings and reviews to the site.

Today, the company's legal name is Dollar Tree, Inc.

In 2008, Dollar Tree earned a place in the Fortune 500.

So Dollar Tree now has a dedicated housewares section in some stores.

Costco gained 3.7 percent for the week, while Dollar Tree rose 9.8 percent.

Dollar Tree is the largest national chain to sell merchandise at a single price.

"Dollar Tree is becoming an anchor of some of the smaller shopping centers that we have," he said.

Some retail experts have questioned whether Dollar Tree will be able to stick to its $1 guarantee as prices rise for everything else.

Greenbrier is home to the headquarters of the nationwide store, Dollar Tree.