I use box mix stuffing all the time. The local grocery chain has a store brand that's pretty darned good and comes in multiple flavors, including turkey, pork, chicken, and cornbread.
My go to meatloaf recipe is 2 to 2.5 pounds of ground turkey, a box of the turkey stuffing mix, an egg, a splash of half and half, a dash of worcestershire, and a finely chopped onion. Once in awhile I'll also sweat down 8 ounces of chopped mushrooms and throw them in, as well.
Mix everything together and bake.
I'll either top it with BBQ sauce or a half can of cranberry sauce.