Economy 18" Halloween Assortment. Scare up extra profits this Halloween with our Economy Halloween 18" foil assortment. Each case of self-sealing balloons - contains one sided and two sided designs - sure to let your customers know that you have the ghouls for the holiday season. As Halloween becomes more and more of an indoor party event, make sure your customers have all the ghosts, black cats, and witches they could possibly need to decorate their indoor celebrations.