Thread tap storage containers

I've amassed quite a large collection and spent a good time today going through them all forming them into the standard 3 set of all the sizes through metric, sae, bsp etc. This may be a long shot but I'm after some storage solution for them such as when you buy new sets they come in a handy plastic container with 3 slots that they sit in. I've hunted high and low even direct from sellers in china but no-one seems to sell them without their contents. Does anyone at all have a supplier or name for what they may be known as? Sizes range from the smallest BA through to 3/4" sae.

Rob