One of the most valuable palm trees found is called a Variegated Sabal Palmetto or Cabbage Palm. It is extremely rare do to a genetic mutation that keeps it from photosynthesizing normally. The outcome is a mix of green and gold palm fronds. When the tree breeds it almost never passes this mutation on making it very rare, some claim priceless. They have been know to fetch over $20,000 if you can find one.
Another very common palm tree called a Coconut Palm. It isn't native to Florida but rather believed to have originated in East Asia.