With four children ranging from five to 12, up to at least $350 can come from Trish Lee's family budget for back-to-school clothes before each school year.But last summer Mrs. Lee, Temple Mall's marketing director, and her family took advantage of the first annual sales tax holiday."When you spend as much money as I have to, it just gives that extra money for a pair of pants or shoes," she said.The state's second sales tax holiday begins 12:01 a.m. Friday, Aug. 4, and runs until midnight Sunday, Aug. 6. During the period shoes and clothes less than $100 are not taxed.To prepare for the weekend sales frenzy as Texas families look to take advantage of the savings, stores are gearing up for the event. Officials with different area stores say they didn't expect last year's jam-packed shopping atmosphere and are better prepared this time around.At J.C. Penney in the mall, manager Clark Stoneback said more inventory