Twin Roll-out Trundle Bed Frame, Black Finish, Fits Under Almost Any Bed This space-saving, sturdy trundle bed is the perfect solution for a growing family, unexpected guests, or the occasional slumber party. Features a powder coated metal frame and mattress slats to support a standard twin size mattress. Shop for twin trundle bed frame online at Target. Free shipping on purchases over $35 and save 5% every day with your Target REDcard. Shop our great assortment of Bunk Beds and twin over full bunk beds for less at Walmart.com. Free shipping on orders over $35 and free store pickup. .