Thanks Kim and Lacey -
I've never seen these grids at Home Depot. I got mine online, which I wouldn't recommend unless you have to do it that way, because of shipping costs. Suppliers to retail stores sell them - I've also seen them advertised on ebay. I can't remember how much they cost any more - I've had them a few years now.
My mid-rack support happens to be extra pieces of foam board and a cardboard portfolio. Anything firm ought to work okay. I just laid them on top of the wood strips.
When I used them in a show, to make them look nicer, I covered them with a fabric drape.
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