We have a small supply (about 30) of the ""soil correlation trays"" at the Soil Survey Center. They are the small boxes containing individual trays for each horizon. They are the kind that has a lid with the boxes.
These boxes were custom made for the Nebraska State Office. I don't know of anyone using them now, so doubt we could get a large enough order to be reasonably priced.
If you only need a small number we can supply them. If you need many we can provide the address of the manufacturer.