I just took delivery of a special shipment of extra large slabs from Oregon including 2 of these 5x12ft monsters from a 750 year old Sycamore tree.  The Sycamore tree represents strength, longevity, and protection across numerous cultures worldwide including Celtic, Chinese, Japanese, and Native American. 
 
The price is for the rough sawn slab as-is.  Finished into a large dining table the price would start at $14k. Pieces of this scale require 4+ professional movers because of the size and weight including any time it has to be moved in the shop while its being finished.