Iowa
In 2020, Iowa will celebrate this holiday on the first Friday and Saturday of August, meaning the 7th and the 8th. Note that all businesses that are open on these days are required to participate!
You can get clothes and accessories that cost $100 or less each, though make sure to visit the Iowa Department of Revenue for a list of items that are not eligible- most notably, sporting equipment and any clothes that are not considered appropriate for everyday use.