This Thursday through Sunday, August 4th through 6th, is South Carolina’s annual Tax-free Weekend, and shoppers may save between $2 million and $3 million in sales taxes. Arthur Dunn of one Columbia Target store says it’s a busier time for his store than Black Friday, and he expects an increase in business over last year. The weekend is big for small stores, too, like Salty’s Board Shop, where owner Paul Goff expects to sell a lot of khaki pants and other school apparel, plus book bags and