In Australia, how much would a Nikon D3100 body cost?
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If you could tell the price for the camera and lens? Like the cheapest to most reasonable price.
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Check Nikon's website and Amazon.
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Given the current exchange rate I'd say about what it costs here in the States.
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Why would you consider in buying anything especially a camera body from Australia? Everything here is very expensive as it is.
You can try to look on Ebay to give you perhaps a chance in obtaining a new or secondhand version; also try Gum Tree, JB-Hifi, Digital Camera Warehouse and use Teds Cameras as a bench mark. Or you could try a few computer shops such as Scorptech Computers