Assuming you're talking about a standard 24' box truck, they range anywhere from 12k-30k. You could probably find one cheaper if you looked hard enough or went used, but that's the ballpark for a new one. You also have to consider things like maintenance and gas; a box truck is going to be a gas guzzler. They're not as bad as something like an 18 wheeler, but they're still not exactly fuel efficient. If you're just using it for local deliveries, though, you probably won't have to worry about much in terms of maintenance. Just keep an eye on the tires and make sure to do regular oil changes and you should be good to go.