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I agree with Geoff, cheap barlow will not give you any indication of how a good one will perform.
You will get a lot more use out of a 2x barlow than a 3x, which will give too much power most of the time. (and if you want more power than 2x use a barrel extension tube)
Shorter FL EPs that are comfortable to use and work well in an f/5 Dob will cost at least as much each as a good barlow.
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