Buying lunch every day can put a serious dent in the household budget. If each noontime meal costs $6 during the workweek, the tab hits close to $1,500 over the course of a year. But a little planning can yield dramatic savings. Preparing lunch at home in bulk at the start of each week easily pares the lunch bill by half. (For a more precise estimate of potential savings, use Bankrate's lunch savings calculator.) Moreover, a brown-bag lunch provides control over portion size and ingredients. Overall, a win for your wallet, waistline, and health. In honor of National Pack Your Lunch Day on March 10, here are 12 ideas for budget-friendly school or workday lunches.