A used medium duty dump truck usually sells for $20,000 to $40,000. You can occasionally find them in the $10,000 to $15,000 range, but expect a truck with high mileage and lots of wear and tear. At that price, the dump truck may not have a long usable life ahead.
Northern mockingbirds are omnivores. Their main foods are insects, berries and seeds. Insects they eat include beetles (order Coleoptera), ants (order Hymenoptera), grasshoppers (order Orthoptera) and spiders (order Araneae). They eat the fruits of holly, mulberries, raspberries, dogwoods, brambles, grapes and figs.
First off, don't feed it anymore bread and milk. There is too great a danger that the milk will make the baby bird sick. Most of the details on feeding a baby mocking bird are in the post, and check the comments too, as some people have offered great ideas on handfeeding also.