I get where you're coming from, and maybe this isn't for you. I tend to buy 1/8lbs container and it usually lasts me a year or two. At that rate, the difference between local and online is usually taxes, so if I can find a few people that want to cut the cost it would help several people.
But even for you if the maximum weight is 50# and you're buy 30# there is still savings for you.
I like to think, it's not how much money you make but how much you keep that matters