It would be nice that Millenium would sell these separate, as the shelf is spacious and relatively stable due to its 'heavy duty', weighty style.
As for the stand I found that its X-axis locking mechanism isn't really trustworthy, it can come loose with a few wrong turns, since its basically a screw and a spring pressure locked together, so you have to be careful not to do any left turns or it might just come off flying away. Also, it doesn't look as robust as its shelf counterpart.