You don't buy crab bait! It's free all around ya! We never bought any chicken but that's what we used. Mom would buy whole chickens and cut them up. She would save the backs and of course the necks and the organs in the freezer for soups. We always had a ton of bait we could steal and she would never even notice. The frozen chicken would keep the ice tea and the fish bait (worms) just a bit colder until we got to the docks, too.
We used fresh road kill, fish racks and once even stole a roast out of the neighbors freezer (the freezer was on the porch)! We figured it was only fair for all the blue claws we gave her for nuttin', hunny!
But the best producing bait was always YESTERDAY'S stinking rotten chicken!
Yow! Made me wanna