I've used uship.com to get competitive quotations - I've shipped a 500lb generator from CA to NY for $350 and a D2 with (I guess) an 8' blade from Philly to Columbus OH for $600 (which I thought was quite the steal : )
Costs nothing to get a price and you're not obliged to pick any of them.
Some offer insurance, some offer loading, etc
Cheers,
Neil.