>I'd like to top off my bot woth a clear plastic hemisphere, about 24" in
diameter.  Any clues as to >where I might find a source or plactic mfg. that
makes there?

Check your garden centre for individual plant "greenhouses". I have seen
items like this in the UK garden centres, look like they are made from
polycarbonate or similar plastic. Might be a little higher than you want
though.

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