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I have seen some awful dobs. Some of the early ones were really bad. The Celestron ones had cardboard tubes which in theory should be OK but are really susceptible to moisture.
As Allan said the mirror and the mount are the main items.
Just make sure you get to inspect first and particularly avoid any ads with pics lifted from dealers websites rather than the actual scope.
Keep an eye on the classifieds here as good bargains come up from time to time.
Malcolm
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