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Only way to buy cheap is to buy 'pre loved' in the eyepiece classifieds, when you see one buy it quick, or get new from astronomics in the US which is more than you want to pay for now. I used the GSO 2.5 apo Barlow with a 20 and 15mm plossls which worked quite well, depends on what you have now in the eyepiece collection.
Matt
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