My daughter lives in a larger city that has an Ikea, and they sell inexpensive and excellent LECA. Just a thought, if you happen to be around an Ikea, or have a friend who does.
And agree with Ray. My stuff in S/H is likely at lower humidity than yours. The top layer or so dries out pretty quickly. Depending on the plant, I've used a plastic cover on top of pot, a layer of sphag moss, or just ignored the dryness. Most orchids are pretty forgiving of nuance, at least in my culture.
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