Workers recently installed a sign for Dollar Tree, which opened its doors this week in Princeton at 2012 N. Main St. in a portion of the former Walmart. Dollar Tree is a discount variety store chain located throughout the United States. Everything at the store costs $1 or less. There are more than 4,000 Dollar Tree stores in the continental U.S. Dollar Tree stores carry a variety of products, including housewares, party supplies, health and beauty products, toys, gifts, stationary, teaching supplies, books and foodstuffs, according to the company’s website. Company officials were not available to offer more information.