Yeah i'd been watching Craigslist for a while, and kept being too late on the "free wood" posts. finally got one. I couldn't believe i got enough for a dock that big! It's perfect. The guy had a 750 square foot deck he tore out (he even took all the nails out!!!), and most of the lumber was 16 foot. I had to split it with another guy but got the perfect amount for this.

I guess the green/hipster term is "reclaimed" wood.