To get a better sense of the activity that surrounds these wallet-friendly outlets, Mental Floss spoke to three employees of Dollar Tree. Most Dollar Tree and many other dollar store locations have a counter devoted to mylar balloons intended for birthday parties and other events. “Balloons do a ton of business for Dollar Tree,” Brenda says. Dollar Tree, Dollar General, and other chains have come under fire in recent years for tasking store managers with a lot of responsibility in order to keep the costs of staffing low. Customers won't find many familiar faces at a dollar store, but they'll always have Donald.