With the same sentiments I started looking around...
I had a 65l plastic storage box (Classique Collection from Snaith Industries) that the original foam packing for my OTA fitted neatly into with a little trimming. So I bought another one (I ended up chasing it up through Bunnings) which now contains my mount... total cost, about $50
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It's not the sort of thing you'd book onto a plane or train when travelling, but to transport in your own car, it works.
Al.