The Tube Depot has what you want ,they call them Tube cubes,at the bottom of their website home page.
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If you have an available drawer, buy a thick piece of foam to line the bottom of it. Cut evenly spaced slits in the foam which will securely hold your tubes. An added benefit is that they will be easily accessible, and you save damage to the cardboard boxes that they came in; specially important with NOS tubes with the original, usually fragile boxes.