Palmetto log. Remember the Battle of Fort Moultrie in 1776? Fort Moultrie on Sullivan's Island guarded the channel to Charleston and was constructed of palmetto logs. When Sir Peter Parker's fleet attempted to bombard it into submission, they were surprised when their cannon balls bounced off. I believe that palm wood is also used in dart boards as it springs back readily (the wood, not the dart).
If your city has palm trees, contact your Department of Public Works and find out if and when they're cutting one down. Then be there for your share.
BTW, I got my slab when some Mexicans were chainsawing down the palm tree outside the credit union. I asked them if I could have a slab and they said yes. Returning with my 4x4, they even loaded two slabs in for me. :RO: I emptied my wallet (about $8) and gave the contents to the surprised workers and told them in my broken Spanish it was beer money. Haven't set it up yet. :redface: