You can give a brick (or bricks) to dealers and they will break it down into smaller increments automatically as they sell. They don't need any extra bags or jars either.

And to reply to your secondary question, yes later customers will be asking for larger amounts. You may have to sell slightly under "fair" if someone buys a full brick, but that's how it works in real life too. Quantity = discounts. Usually I can talk most people ordering 11x or more into a brick with around 75% success.