I have looked at having a truck shipped before, it's expensive. I live in southern NJ and like you had zero luck finding a Ram 3500 mega cab dually. Tried to work a deal for a truck located in IL to be shipped to a dealership in northeast MD. They got me the price I wanted for the truck but then tacked on 1K to have it shipped. I ended up driving to IL and purchasing it from the actual dealer. Cost me $400 in fuel but still saved me $600 and it was a great break in trip. To bad I had to lemon law it 3 months later. I can give you a few dealerships to look at that have large dually inventories. For Ram trucks look at: Kernersville Dodge in NC, Big O Dodge in SC, Tony Domiano Dodge in PA, Keene Dodge in MD. Kernersville has best prices on the east coast. For Fords the best prices around are at Koons Ford in MD. Koons has multiple dealerships around the Baltimore/DC area but the one in Sterling VA has largest selection of duallys. I can tell you if you really want to save some money on a Ford you need to head to Texas and go to Vernon Ford in Vernon Texas. Sorry i dont have any Chevy or GMC info. Hope this helps, hope you find what your looking for.