Free: Contests & Raffles.
Get a few rubber bullet rounds or bean bag rounds for your shotgun. A quick education might make them think twice next time.
I grew up on kodiak island in Alaska,the sealions started hanging around the docks in the mid 80's. I'd be careful with your dog around them,the sealions were known and seen to grab a dog every now and then,the dogs did not survive,once they get them in the water that's it. They even pulled a guy off a boat once,he was slanting against the rail on the boat,one jumped up and grabbed him by an ass cheek,pulled him over and then let him go,I personally knew the guy and he told me the story. J