Generally, the going rate for newspapers dropped off at a central collection depot is 1 cent per pound, and the papers need not be bundled. In addition to old newspapers, you should organize your time and schedule to call upon all the businesses, stores, and warehouses in your area. Talk to the business owners and store managers and ask them if you can haul away their old cardboard boxes. If there's competition in your area, you might end up having to pay for these boxes, provided they're clean. The thing to do is to call upon everybody who uses paper products or cardboard boxes.
Grocery stores are an excellent source of cardboard.
Remember, the more people you have giving you paper, the more money you are going to make. Many already established recycling services do not bother with the smaller stores and warehouses, but these add up quickly if you are diligent in finding a number of them. Check close by in your surrounding area, and find out if the businesses are satisfied with their present recycling pickup service. Ask first if you can haul away their old boxes free of charge. Many of the smaller stores will give them to you because it decreases the load for their rubbish service to haul away.