You may want to consider paying a bulk skid rate and having the items ship via freight. I would be quite surprised if you were to find competitive rates with either of the regular carriers including UPS, FedEx or USPS for this much weight shipping ground etc whereas with a freight company you can pay per skid and perhaps even take advantage of that by shipping additional stuff as well.
Another thing worth considering is if you know anyone in your area that owns a business - family, friends etc that do a lot of shipping they will have special rates for these types of items and you may be able to save a bunch by shipping under their account.
Btw as a side note if you are looking for packing supplies - i believe someone requested this earlier try this company theboxery.com. They have a few location but main is in NY for all those NY people out there.
Best,