Get a price from a volume dealer and try to get a local dealership to match. If they do, great. If they don't, buy a plane ticket and go get your truck.
Without trying to open up too much of a can of worms in the 250 vs 350 debate, being in NJ I would do some research on registration fees and other restrictions that may apply to a 10k+ lb GVWR vehicle. It wouldn't surprise me if it was one of the states where you might be better of with a 250 or a 350 with a 10k lb GVWR.
A 2018 Ram 2500 has a 6500 lb RAWR. The payload on on any diesel 3/4 ton is low but that's meaningless so don't let that dissuade you if you can get a good deal. Also the 2018 Rams still use the reliable CP3 pump, not the time bomb CP4 in the 2019 Rams and all 6.7 Powerstrokes. If you can jump on a 2018 Ram CTD I'd do it fast.