If you see a darker skinned thin guy with shoulder length curly hair and a ball cap riding a bike with a blue and white ice chest on it (Arquel) flag him down.
Sometimes he has grouper, sometimes lobter, sometimes shrimp, one time fresh stone crab claws, etc. Always good, always fresh. Make sure you count the tails though!
And if you see anyone coming off a dock lugging 5 gal. white buckets, flag them down. Have snagged some awesome stone crab claws that way.