Are you looking for Riker cases which are pretty inexpensive or something custom built and high quality? Welcome to Treasurenet. Theses are Riker cases and come in different sizes.
Hammer you might want to repost this in the Civil War forum and some of the guys there might be able to give you some sources of where they get theirs.
The bullets can roll around in the Riker cases. Maybe someone will come along who buys them and can tell you a good place to buy them. Ruddles Mills is a source that my husband has used before and they have several different types of cases to choose from.