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you could make your own . It will cost a fraction off a comercial one and will be to the size YOU want.
I made a pier for my old 6"refractor from second hand steel pipe that I found from a place in Brisbane that sells old pipe line materials . It's diameter is 220mm but they had lots of different sizes from smaller up to big enough to stand in . The 1600mm piece I got cost $60. 00 cut to length . You would need to weld a plate on to suit your mount and fill it .
You may be able to find some on in the yellow pages in your area as I did that sells old pipe line materials .
You could use a 2400mm concrete pipe filled with concrete and threaded bar to mount a plate on .
MHodson
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