Sevin is probably your best choice.
I have heard that if you plant a few marigolds in your veggie garden, it will help control the pest population. Never tried it for myself, but i will next year. Your best bet I think would be to find out what bugs are stealing your profits and try going to this site:
Not sure if these are useful, but I tried to find natural ways to repel insects. Hope this is helpful!
First determine which insects are actually doing the damage, you dont want to kill all of them just the harmful ones, get , if possible some ladybugs and certain kind of mantis you can buy from the garden center if they carry them, you need natural predators to eat the bad bugs, they will stay there as long as there are food(bugs)for them to eat, that way you use no chemicals, also Diatomaceous Earth is good and safe, natural