Try a good upholstery shop or specialty foam shop. You should be able to find various grades and firmness. Avoid the cheap white stuff; it degrades into small particles designed to get into your camera mechanicals.
I like 1 to 1.5 in of flat foam on the bottom, topped with a 2 in. piece cut to match my equipment (you can have various "versions" of this layer to match different equipment). On the top, I like using "egg crate" foam. A very sharp fillet knife works well for cutting.
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