We used "Tiger Paws" this year - it really worked well for my young Tiger cub Scouts. They were all given 5 small Tiger paws printed out on the computer - if they misbehaved they gave me a paw- if they were really well behaved or used good manners they earned a paw back - if they had all 5 paws at the pack meeting they got a small party favor type trinket or candy. I would ask, "You wanna give me a paw??", and behavior miraculously improved!!
It got a little expensive because it worked so well but the parents said they liked it - so next year the Parents will rotate buying the prizes instead of them coming from Den Dues or my pocket.