Starting Friday, Missouri consumers will be able to buy their school supplies, back-to-school clothing, even computers and software for the upcoming school season, free of state, and in some cases, local taxes. Retailers, though, might not see it as the boon it is purported to be. The state sales tax holiday is this weekend. President of the Missouri Retailers Association, David Overfelt, says while saving nearly four-and-a-quarter percent in state sales tax and possibly more in local sales taxes, most consumers will take advantage of the sales tax holiday while they shop the regular back-to-school sales. Although they have the option to participate, about 180 communities and nearly half of the state’s counties will still charge their local taxes. Overfelt says that’s a shame. He says full participation from local governments would make the sales tax holiday weekend a real draw to residents of neighboring states.And Overfelt does not anticipate mandating the sales tax holiday on local districts. But whether or not a local community particpates, every shopper will still get the state sales tax discounted and Overfelt says that will still make this weekend a good one to shop. The sales tax holiday runs through Sunday.