Amazon's website states that they don't price match with others. Not sure what they do in situations like this one, where their own price dropped. Keep us posted! I'm interested to find out if they'll price match their own price and give you straight refund.
FYI, if Amazon requires you to return the camera, and then buy it again at the lower price, in order to avoid the return shipping fee, simply refuse receipt of the $600 camera shipment. If you refuse the shipment, it automatically gets sent back to Amazon, and Amazon gives you a full refund including the original shipping cost, and does not deduct the return shipping cost.
I refused shipment once because the tripod that I bought did not arrive in time for a trip.