Where can twelve and thirteen year olds get jobs that actually pay?
Try looking into getting a newspaper route. Check with the local newspapers in your area. They often pay well, better than many other “jobs” that someone underage an get. Some pay you a set amount and you turn in what you collect, and some let you keep what you collect from the customers. Keeping what you collect is more common with free newspapers. Though collecting for a free newspaper may seem a contradiction, remember that they are paying for the service of delivering, not the product.