i think customers prefer the tubes over the small tins, start with those jack. i would put a label on them. lot's of suppliers out there, just google 'lip balm tubes'. a few; sks bottle & packaging, elements bath and body, specialty bottle, even amazon sells the tubes. flavors? i think the fruit flavored lip balms probably appeal to the kids, i myself don't care for them. i asked a lot of folks what lip balms they liked to get an idea. i stick to a peppemint based or natural, but also will make a limited amount of other flavors.
look over some of the recipes on that thread bakers gave the link to, some good recipes to try out!