Backpacks, highlighters, notebooks. It's time for back to school shopping. Kids start going back to school in two weeks. Anna Kridler has been teaching math at Concord High School for 13 years. "I start thinking about my back to school shopping typically in June as soon as school ends," said KridlerShe says she uses smart phone apps for different stores to comparison shop. "End of July, beginning of August is definitely the best time to start back to school shopping," Kridler said.