I think your best chance would be to approach craft shops selling expensive stuff not ones selling tat. Have you tried Etsy, you need to try and reach the top end of the market, not eBay.
Gardening on the wild, windy west side of Dartmoor.
We currently have a closed system terrarium on our bay windowsill. My husband planted it late last fall in his classroom with his primary students each making their own. They had a few violas that would never survive in there, but I gave him some water rooted cuttings from my tradescantia pallid purple heart house plant. Nearly a year later, it is still going strong and healthy, unopened and unwatered. Most of the time it has too much condensation to see anything other than dark purple and weirdly yellow hairy aerial roots. It is in a gallon plastic container. This year I got him a glass one to try it with, just because the other one is ugly and still has a bit of sticky label half scratched off.
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Have you tried Etsy, you need to try and reach the top end of the market, not eBay.